Timeline

This is the timeline of the known events of the games of the SS undefined.

The End of the Human Era

 * Around 12,000 years ago - Humans live as the dominant species of Earth, with their history being implied to largely mirror that of real life humanity, apart from reaching a further point of technological advancement than has been reached in reality.
 * Around 12,000 years ago - While academic circles warn of significantly rising sea levels, no policy is enacted to deal with the situation. Meanwhile, the world becomes embroiled in warfare.
 * Around 12,000 years ago - A professor creates a cryogenic capsule that could freeze a living creature for thousands of years, and uses it to preserve his pet cat, Judd, who was also injected with a medicine that made him immortal. The capsule also contains a single cell of Judd's DNA, making it capable of creating a clone of him. This was meant as a backup measure in case Judd did not survive the freezing process,  as well as to prevent Judd from being lonely after he awoke from the capsule.
 * Around this time, the professor also creates an artificial intelligence for the purpose of passing down humanity's knowledge to the next form of intelligent life, in hopes that humanity's mistakes would not be repeated.
 * 12,000 years ago - A series of natural disasters, including severe flooding caused by rising sea levels as well as volcanic eruptions, cause the extinction of almost all life on the surface of Earth.
 * In The Art of Splatoon, a concept manga is shown that indicates the cause of the sudden dramatic rise in sea levels was a nuclear missile hitting Antarctica, melting the ice. This information has thus far never been repeated in other official material, so it is unknown if it is still considered canon to the series proper.
 * 12,000 years ago - Some humans survive the flooding and reside in Alterna, a shelter and settlement located under what was once Mt. Fuji, while others who try to escape to other underground domes perish.
 * 12,000 years ago - Another group of survivors leave Earth in search of a new planet. They create the space shuttle Ark Polaris, and bring with them many of Earth's species in cryogenic stasis.
 * 12,000 years ago - When trying to reach the edge of the solar system, the Ark Polaris is damaged by debris, damaging its navigational system and forcing the crew to go back to Earth. Having run out of fuel needed to land, the Ark Polaris drifts in the Earth's orbit for the next 10,000 years.
 * Around 12,000 years ago, 25 years after Earth's flooding - Alterna's scientists, having been appointed as leaders of the settlement, make many innovations in the hopes of establishing a sustainable ecosystem in the cavern, one of their inventions being liquid crystals from the bodily fluids of squids. These crystals had the ability to effectively read the minds of living beings, changing color in response. These crystals would then be mass-produced and used to line the walls and roof of Alterna, which, reflecting the human's desire to see the surface of Earth again, took on the appearance of the sky.
 * Around 12,000 years ago - Alterna's leaders are replaced by the next generation, who, desiring to see Earth's surface again, create the Spirit Lifter. During the first launch test, the energy from the rocket's boosters overload the cavern's liquid crystals, provoking a violent chain reaction that causes the stone walls to break and rain debris on the settlement. This kills most of the inhabitants of Alterna, leaving the rest to die shortly after.

Before the Mollusc Era

 * 12,000-2,000 years ago - For 10,000 years, there is no known activity of sentient life.
 * 12,000-7,000 years ago - After Alterna's collapse, many of the liquid crystals that once covered the cavern's walls fall into the waters below and break into microscopic fragments, being absorbed by generation after generation of the sea creatures living in Alterna's waters. As the crystals had repeatedly absorbed the wishes of the humans in Alterna, the crystals retained these feelings and passed them onto the creatures that absorbed them, resulting in sea life gaining something reflecting humanity's desire to return to surface of Earth. These crystals also accelerate the evolution of the sea creatures, until one day they set foot on dry land, eventually leaving Alterna and reaching Earth's surface. The region surrounding Alterna eventually becomes known as the Splatlands.
 * 12,000-7,000 years ago - At some point global water levels recede.
 * Around 7,000 years ago - A squid is born with "unique characteristics", possibly referring to human-like anatomy. This squid is considered a prophet by their fellow squid for numerous revelations they share, and eventually comes to be considered a progenitor to the modern-day Inkling.

Start of the Mollusc Era

 * 2,000 years ago - The Mollusc Era is considered to begin, although sea creatures reached the surface 5,000 years before.
 * 2,000 years ago - Judd is released from his capsule, and becomes the judge of the earliest known Turf Wars.
 * 2,000 years ago - The Ark Polaris crash-lands back on Earth, with all of its inhabitants dying in the process, with the sole exception of one of the bears, then known as Bear #03. Bear #03, having somehow gained knowledge from thousands of years of dreaming, uses the navigational equipment of the Ark Polaris to search for another mammal left on Earth, instead finding the ruins of Alterna. He repairs the facilities of the settlement and begins using them to research the remaining liquid crystals. Eventually, by compounding the crystals with his own fur, he learns to create a substance capable of turning any creature it touches into a mammal.

The Great Turf War and surrounding events

 * Over 100 years before the events of Splatoon - Inkopolis and Calamari County are founded. Calamari County's customary chorus is composed to celebrate and respect the bounty of the sea.
 * 127 years before the events of Splatoon - Craig Cuttlefish is born.
 * Over 100 years before the events of Splatoon - DJ Octavio is born.
 * Around 100 years before the events of Splatoon - Sea levels rise again, forcing the Inklings and Octarians in Inkadia to fight over the remaining dry land. Around that time, the Octarians build the Great Octoweapons.
 * It is implied that the Splatlands were not affected by this flooding in the same way, due to the three lights that appeared and consumed the disaster. As a result, the Great Turf War does not appear to have affected the Splatlands, at least not to the same extent as Inkadia, and Inklings and Octarians in the area seem to have remained at peace with each other.
 * During the Great Turf War - Cap'n Cuttlefish forms the original Squidbeak Splatoon as its leader, together with two other Inkling members, Sheldon's grandfather Ammoses Shellendorf, and possibly Judd.
 * During the Great Turf War - Ammoses Shellendorf creates blueprints for several weapons, including the Hero Shot.
 * During the Great Turf War - The Octarians are victorious throughout the first battles of the Great War, aided by their Great Octoweapons, as well as the fact that Inklings were unable to wake up early enough in the morning to defend themselves.
 * During the Great Turf War - As the Octarians storm the Inkling's central stronghold, a power cord accidentally being unplugged causes their weaponry to deactivate, which allows the Inklings to defeat them. Judd delivers the verdict of the Inklings' victory.
 * After the Great Turf War - The Octarians are forced into hiding into Octo Valley and Octo Canyon, where they live in underground domes once built by humans as shelters.
 * After the Great Turf War - Inkopolis' Great Zapfish is born, and its electricity is used to power the city.
 * After the Great Turf War - In the wake of the Inkling's victory, Turf Wars go on to become a popular competitive sport.

Before the events of Splatoon

 * Before the events of Splatoon - The Octarians' underground domes show signs of collapsing, and begin to lose power.
 * 21 years before the events of Splatoon 2 - Pearl is born.
 * Likely 17 years before the events of Splatoon - Callie and Marie are born in Calamari County.
 * 18 years before the events of Splatoon 2 - Marina is born.
 * At least 14 years before the events of Splatoon - Agent 3 is born.
 * At least 14 years before the events of Splatoon 2 - Agent 4 and Agent 8 are born.
 * 14 years before the events of Splatoon 3 - New Agent 3 is born.
 * Some years before the events of Splatoon - Inkopolis hosts its first annual Youth Folk-Singing Contest. Callie and Marie win the contest, and their career and fame as singers begin.
 * Pearl also participates in a Youth Folk-Singing Contest, though it is unknown if it is exactly the same event that Callie and Marie participated in, or a contest from a later year. The destructive power of her voice causes some damage to the event's venue.

Events of

 * Before the events of Splatoon - After moving to Inkopolis, Callie and Marie, now known as the Squid Sisters, begin their career as hosts of the Inkopolis News program, where they announce the current battle stages and Splatfests.
 * Annie, Moe, Crusty Sean, Jelonzo, and Sheldon begin operating their shops at Booyah Base. Spyke also works from a back-alley in Inkopolis Plaza.
 * Squid Squad becomes active, marking a turning point in Inkling music. Their song Splattack! is considered to have set the standard for battle music, and Now or Never! goes onto be covered by numerous other musical groups.

Octo Valley



 * Shortly before the events of Octo Valley- The Great Zapfish providing electricity to Inkopolis is stolen by the Octarians, along with several smaller Zapfish.
 * A young Inkling, having recently moved to Inkopolis, follows Cap'n Cuttlefish down a manhole in the Plaza, ending up in Octo Valley.
 * Cap'n Cuttlefish recruits the Inkling as Agent 3 of the New Squidbeak Splatoon, enlisting them to help recover the stolen Zapfish.
 * With Cap'n Cuttlefish's guidance, Agent 3 recovers several Zapfish and does battle with three of the Great Octoweapons. After the defeat of the Octowhirl, Cuttlefish is captured by DJ Octavio, though his identity is not known to Agent 3 at that point.
 * Having received an SOS signal from Cap'n Cuttlefish, Agent 1 and Agent 2 make contact with Agent 3, taking over the role of guiding them through Octo Valley, now with the new goal of rescuing Cap'n Cuttlefish.
 * After recovering a few more Zapfish, Agent 3 then battles the Octomaw, before eventually reaching the final area of Octo Valley. After clearing this area, they then finally reach DJ Octavio.
 * At one point during Agent 3's battle with DJ Octavio, Agents 1 and 2 hijack the radio waves of Octavio's performance to play Calamari Inkantation. This battle is witnessed by many Octarians, being interpreted as a concert with DJ Octavio as the opening act for the Squid Sisters. At least two known Octarians, Marina and Agent 8, are inspired by the song to defect from the Octarian military.
 * After DJ Octavio's defeat, Cap'n Cuttlefish is rescued and the Great Zapfish is recovered, restoring Inkopolis' power supply. DJ Octavio is imprisoned in a snow globe to prevent him from causing further trouble.

Events of Squid Sisters Stories
The events of Squid Sisters Stories were set in between the events of Splatoon and Splatoon 2, starting with the final Splatfest of the first game.
 * Just over 1 year into their career as Inkopolis News presenters, the Squid Sisters host their final Splatfest, with Marie winning. This final Splatfest causes the Squid Sisters to reach new heights of popularity, becoming the biggest stars of Inkling society.
 * Callie and Marie spend an increasing amount of time apart as their careers take different paths following the release of their solo singles. Callie makes many guest appearances on variety shows, where filming often continues until late at night. Meanwhile, Marie becomes a frequent guest on music shows, in addition to performing solo at live concerts.
 * Crusty Sean quits his job as the store manager of Shrimp Kicks in order to open a food truck, the Crust Bucket.
 * Annie also apparently quits her job at Cooler Heads, in search of a more detail-oriented job involving less interaction with people.
 * Marie takes a trip to Calamari County to visit her parents, intending to stay for three days. She invites Callie to go with her on the train, but due to having an appointment Callie refuses and promises to meet up with Marie there the following day.
 * The day Callie is meant to meet Marie in Calamari County, she fails to show up entirely. Marie attempts to get into contact with Callie through her manager and by calling their shared apartment, but is unsuccessful.
 * Marie cuts her trip short and returns to Inkopolis to search for Callie. Finding their apartment empty with no sign of Callie, Marie then goes to Octo Valley, finding Cap'n Cuttlefish's shack deserted but otherwise undisturbed, with the exception of the snow globe beside it that previously contained DJ Octavio having been shattered.
 * Marie returns to Inkopolis to find that the Great Zapfish has once again been stolen, though the citizens of Inkopolis seem relatively unfazed by the situation as they expect it won't be long before it is returned.
 * In hopes of quickly finding help, Marie goes to Inkopolis Square in hopes of recruiting someone to aid in finding Callie and the stolen Zapfish, leading into the events of Splatoon 2's Octo Canyon.

Events of
Splatoon 2 takes place 2 years after the events of Splatoon.
 * Before the events of Splatoon 2 - Grizzco Industries is founded by Bear #03, now known as Mr. Grizz, for the purpose of acquiring the Golden Eggs that were to be used to power the Spirit Lifter, which also had an unknown role in the creation of Fuzzy Ooze.
 * Before the events of Splatoon 2 - Marina defects from the Octarian army to become a citizen of Inkopolis after listening to the Calamari Inkantation, becoming a huge fan of the Squid Sisters in the process. She meets Pearl, and the two eventually become the pop idol duo Off the Hook.
 * Before the events of Splatoon 2 - Jelfonzo is born after splitting off from Jelonzo, and goes on to run his own clothes store, Ye Olde Cloth Shoppe.
 * About a year and a half before the events of Splatoon 2 - Inkopolis Square, once a run-down area with a minor crime problem, undergoes redevelopment efforts, eventually becoming a popular hangout spot for Inkling youth.
 * Three months before the events of Splatoon 2 - A cleaner at Calamari Research Labs, where Judd's cryogenic capsule is stored as a historical relic, accidentally unplugs the capsule. This causes the cell stored in the capsule to multiply, leading to Li'l Judd being born.
 * Cap'n Cuttlefish and Agent 3 go on a research trip to the cape, leading to their absence for the events of Octo Canyon, and possibly setting up their presence in Octo Expansion.
 * The Salmonids presumably begin their great migration that occurs every 70 years, moving to waters near Inkopolis.
 * Annie starts an online retail service in the form of the Splatnet Gear Shop.
 * Squid Squad disbands, with the band's former bassist, Quinn, eventually becoming part of the new musical duo Diss-Pair.
 * The Chirpy Chips also briefly disband at some point, but reunite shortly after with the release of Blitz It! and Wave Prism.
 * Ammo Knights relocates to Inkopolis Square's Galleria, with Sheldon continuing to run the store.
 * Off the Hook become the hosts of Inkopolis News, which is now filmed in Inkopolis Square, taking on the responsibility of announcing the current battle stages and Splatfests.

Octo Canyon

 * Picking up where Squid Sisters Stories left off, Marie recruits Agent 4 to the New Squidbeak Splatoon in order to help find Callie and the stolen Zapfish in Octo Canyon.
 * After Agent 4 defeats the first Octoboss they encounter, Marie calls in Sheldon to assist them as well by providing in-development weapons to Agent 4.
 * Eventually, after the defeat of Neo Octostomp, a brainwashed Callie makes contact with Agent 4 and Marie, telling them to leave. Marie doesn't initially recognize the caller as Callie, until she contacts them again after the defeat of the Octo Shower, when she recognizes her by the fact that she's holding the phone upside down.
 * With Marie shocked by the realization that Callie is working with the Octarians, she continues guiding Agent 4 through Cephalon HQ until they eventually reach the final boss. Here, DJ Octavio reveals that he is the one responsible for Callie's disappearance, having brainwashed her with a pair of "hypnoshades".
 * Agent 4 does battle with DJ Octavio and the brainwashed Callie, as the two perform a remixed version of Callie's song Bomb Rush Blush. Eventually, Marie and Sheldon arrive, with Sheldon driving a flying truck that Marie stands on. Marie takes aim and shoots Callie's hypnoshades off with a charger, then begins singing her own song in an attempt to snap her out of her hypnosis, resulting in a combination of their two solo songs being performed. This eventually leads to the final phase of the battle, where Callie, freed from her hypnosis, joins Marie in singing Spicy Calamari Inkantation as Agent 4 defeats DJ Octavio with a modified Rainmaker provided by Sheldon.
 * With DJ Octavio defeated once more, the Great Zapfish is returned again to Inkopolis, now resting around Deca Tower, and Callie and Marie are reunited. Off the Hook report on these events on Inkopolis News, playing the Squid Sisters' new single Fresh Start on their program to celebrate.

Events of
Octo Expansion is written so that it could possibly happen both before or after the events of Splatoon 2 Octo Canyon, depending on the order they are played in. As such, its placement in the timeline is not entirely certain.


 * Over the course of 12,000 years leading up to the events of Octo Expansion - As Inkling and Octarian society develops, Commander Tartar, the artificial intelligence created by the professor, strays from its original intended purpose of passing on humanity's knowledge. Its disgust for the new species' needless warfare and obsession with fashion, as well as its insanity caused by thousands of years of isolation, leads it to give itself a new directive of destroying the current life on Earth and creating a new form of life to replace it.
 * An unspecified amount of time before the events of Octo Expansion - Kamabo Corporation is founded by Commander Tartar, for the purpose of acquiring DNA from test subjects to be used to create new life after the planned eradication of Inkling society. This DNA is acquired by blending subjects who complete the tests given to them by Kamabo Co. into a unique kind of ink, which is used to "sanitize" a number of Octarians.
 * Kamabo Co. also begins to operate the Deepsea Metro, which is used both to transport the company's test subjects to stations and as a regular subway by the denizens of the deep.
 * Numerous identical beings, all known as C.Q. Cumber, are also at some point created by Kamabo Co. in order to operate the Deepsea Metro.
 * Before the events of Octo Expansion - Exactly 10,007 subjects enter Kamabo Co.'s testing program, though it is unknown exactly how many of these subjects were killed for their DNA. At least one subject, Iso Padre, is known to be currently surviving, having given up on the program after only completing two stations.




 * Shortly before the events of Octo Expansion - Agent 3 battles an Octoling in Octo Valley. This battle is interrupted when both of them are attacked by an unknown assailant. Agent 3 and the Octoling, along with Cap'n Cuttlefish, are then presumably captured and taken to the Deepsea Metro.
 * The Octoling, now having lost all memory, is awoken in an abandoned subway station by Cap'n Cuttlefish. Cuttlefish calls a truce so that they can find a way to escape together.
 * After finding a way through this abandoned area, the Octoling and Cuttlefish find themselves in the metro's Central Station, which is empty except for a ringing telephone, which the Octoling answers.
 * The Telephone tells the Octoling about "the promised land", which it says they can only reach if they prove themselves by collecting the four "thangs". It gives them a CQ-80 and CQ Card, and deems them "applicant 10,008". Cuttlefish interprets "the promised land" to mean the surface, and nicknames the Octoling "Agent 8" as a shortening of their applicant number. Agent 8 and Cap'n Cuttlefish then board the Deepsea Metro train.
 * Meanwhile, Pearl and Marina are on Mount Nantai, where they have found a radio that allows them to make contact with Cap'n Cuttlefish. After the situation is explained to them, the two agree to help Agent 8 and Cuttlefish escape the metro.
 * With the help of Cap'n Cuttlefish, Pearl, and Marina, Agent 8 completes several test stations in the Deep Sea Metro, and eventually collects all four of the thangs, bringing each one back to the Central Station.
 * With all four thangs collected, the Telephone asks Agent 8 if they are ready to enter "the promised land", to which they agree. Following this, the Telephone assembles the thangs into a giant blender, claiming it to be the door to the promised land.
 * Agent 8 and Cap'n Cuttlefish enter the blender, which nearly leads them to be blended before Marina hacks into Agent 8's CQ-80 to activate the distress signal. This prompts Agent 3 to suddenly smash through the ceiling, destroying the blender and knocking themselves unconscious.
 * Agent 8 takes the employee model CQ-80 that was in Agent 3's possession, using the blueprints of the test facility stored on it to find an exit, while Cuttlefish stays behind until Agent 3 wakes up.
 * As Agent 8 makes their way up through Kamabo Co.'s testing facilty, they eventually lose contact with Cap'n Cuttlefish, who is apparently attacked and captured by a partially sanitized Agent 3. As they reach the Spinal Phase and try to take an elevator to the surface, Agent 8 is attacked by Agent 3 as well, leading to a battle.
 * Agent 8 defeats Agent 3, knocking them unconscious once more but freeing them from their mind control. After this, the elevator continues its ascent, leading Agent 8 and Cuttlefish to the surface, where Pearl and Marina arrive in a helicopter to meet them.
 * As Pearl and Cuttlefish celebrate the escape, the NILS Statue that contains the entire facility rises from the ocean. It is at this point the Telephone finally reveals its identity as Commander Tartar, and its goal of destroying Inkopolis and creating a new "ultimate lifeform". The statue's mouth opens to reveal a cannon full of sanitizing ooze aimed at the city, and begins charging enough energy to be capable of destroying the entire world.
 * Marina determines that the statue is solar-powered, and comes up with a plan to, using her prototypical Hyperbombs, entirely cover the statue in ink to make it unable to fire its weapon, then have Pearl hit the statue with a shockwave from her voice. With only three minutes before the statue finishes charging, Agent 8 is tasked with manually detonating each of the Hyperbombs.
 * Despite being unable to reach a full charge, Tartar prepares to fire the statue's cannon anyway. Pearl uses the Princess Cannon to create a massive beam from the power of her voice, intercepting the cannon's own beam and destroying the statue, and Tartar with it.
 * After the events of Octo Expansion - Pearl and Marina return to Inkopolis Square, taking Agent 8 with them.
 * After the events of Octo Expansion - Kamabo Corporation is described to be "in disarray" after the defeat of Tartar. Despite this, the Deepsea Metro continues operating without interruption.

Events of
Splatoon 3 takes place 5 years after the events of Splatoon 2, and 7 years after the events of Splatoon.
 * Before the events of Splatoon 3 - Cuttlefish passes down his title as Captain to Agent 3, leaving the position of Agent 3 open to new recruits.
 * The city of Splatsville develops rapidly, as many Inklings and Octolings move there following the results of Splatoon 2's Final Fest.
 * One year before the events of Splatoon 3 - Ammo Knights once again relocates, this time to Splatsville.
 * The band Deep Cut become hosts of Anarchy Splatcast, a television and radio show that fulfills a similar role to Inkopolis News for residents of Splatsville.
 * The former members of Squid Squad, with the exception of Quinn, form a new band, Front Roe, with a new band member replacing their former bassist.
 * A train route is constructed between Splatsville and Inkopolis Plaza, allowing easier travel between the two areas.
 * Annie returns to working at Cooler Heads, though she continues to operate the Splatnet Gear Shop in addition to this.
 * Fred Crumbs takes a job at Shrimp Kicks, while Sheldon's protégé Shelly and Donny take over the Inkopolis Plaza location of Ammo Knights.

Return of the Mammalians



 * The Great Zapfish supplying electricity to Splatsville is stolen, which is reported on by Deep Cut on Anarchy Splatcast.
 * A young individual living in the Splatlands, along with their companion, a friendly Smallfry, enters a manhole in Splatsville, ending up in the Crater. Here they meet Craig Cuttlefish, who recruits them as the new Agent 3 of the New Squidbeak Splatoon. Suspecting the theft of the Great Zapfish to be the work of the Octarians, Cuttlefish guides Agent 3 throughout the Crater, which has been infested with Fuzzy Ooze.
 * As Agent 3 reaches the center of the Crater, they are confronted by DJ Octavio, who accuses Cuttlefish of being responsible for the disappearance of his troops.
 * Agent 3 defeats DJ Octavio, who denies being responsible for the theft of the Great Zapfish. The conversation is interrupted as the ground beneath them collapses, with Agent 3 getting separated from Cuttlefish and losing most of their gear.
 * Agent 3 wakes up on Future Utopia Island, a site of Alterna, which had been located beneath the Crater. Here, they are greeted by the rest of the New Squidbeak Splatoon, comprised of the previous Agent 3, who is now Captain, as well as Agent 1 and Agent 2.
 * With the New Squidbeak Splatoon acting as mission control, Agent 3 begins to explore Alterna in hopes of finding Cuttlefish. In the first kettle they enter, they are also introduced to the computer system of Alterna, O.R.C.A., who appears to be the one assigning Agent 3 the objectives to complete in each mission.
 * As Agent 3 attempts to leave the first site, Deep Cut appear, having apparently followed them into Alterna after their fall. Apparently thinking that the New Squidbeak Splatoon is after the "treasure" located in Alterna, they boast that they are the only ones who may take it before making their exit.
 * Agent 3 continues making their way through Alterna, attempting to follow the signals Marie believes are coming from a tracking device on Cuttlefish. The signals are actually coming from the treasure Deep Cut is after, which each member individually attempts to battle Agent 3 over.
 * After Agent 3 defeats Frye, Cuttlefish makes contact with the New Squidbeak Splatoon, telling them that he's been kidnapped and is now locked in a dark room.
 * After Agent 3 defeats Shiver, Cuttlefish makes contact with them again, but the conversation is interrupted by his captor, who reveals himself to be Mr. Grizz. The call then apparently loses signal.
 * Eventually, Agent 3 defeats Big Man in battle, taking the final piece of the treasure. The New Squidbeak Splatoon then uses this treasure to construct a device which the Captain uses to cut off the fur surrounding the Alterna Space Center, allowing the team entry so that they can save Cuttlefish.
 * Deep Cut appear to demand the treasure, and Marie allows them to have it since they don't need it anymore. Deep Cut are touched by her generosity, leading them to apologize for fighting Agent 3, as well as ask Marie to be their boss, which she reluctantly accepts.
 * With Deep Cut now joining the New Squidbeak Splatoon in supporting Agent 3, they make their way into the space center. When they finally reach Cuttlefish, they find him dried-up and seemingly lifeless. It is also at this point when they finally see Mr. Grizz, who is now revealed to be a giant bear. Mr. Grizz escapes on Alterna's rocket, ready to use it to cover the world in Fuzzy Ooze.
 * The Captain cries upon finding Cuttlefish's body, the hydration of which revives him, though he is now apparently stuck in the form of a floating dried squid.
 * Deep Cut then appears and assists Agent 3 in getting to space, where they battle Mr. Grizz on the surface of the rocket. After a certain point in the fight, Mr. Grizz absorbs the Fuzzy Ooze on the rocket and knocks Agent 3 and Smallfry into space. The two are saved by the sudden appearance of DJ Octavio in the Octobot King L3.Gs, who proceeds to assist Agent 3 in finishing the battle as Deep Cut and the Squid Sisters perform Calamari Inkantation 3MIX to hype them up from the ground. Smallfry is then apparently transformed by some sort of power, becoming gigantic.
 * Together, they defeat Mr. Grizz, who apparently comes to peace with the fact that the world cannot return to the time of mammals in the final moments before he dissolves into Fuzzy Ooze.
 * Agent 3, Smallfry, and DJ Octavio return to Earth, and Splatsville's Great Zapfish is restored to its rightful place. Deep Cut reports this on the news, along with the release of the new Squid Sisters single Wave Goodbye, apparently only realizing at that moment that the Squid Sisters were in fact their new bosses Agents 1 and 2.
 * After the events of Return of the Mammalians - Li'l Judd is implied to take over the operations of Grizzco Industries after the defeat of Mr. Grizz.