Master Mega

Master Mega is a shark which aids Shiver in Return of the Mammalians.

Appearance
Master Mega is a large shark with a saddle which Shiver sits on, rocket boosters, and a spawn point for when Shiver gets splatted. He also wears a pair of 18K Aviators on his head. Shiver rides on his back until enough damage is dealt. When Master Mega has taken enough damage, his regular eyes turn into an X shape, similar to how some cartoon characters have "X" eyes when they die.

Return of the Mammalians
Shiver and Master Mega are the third bosses of the single-player mode Return of the Mammalians, in the mission, The Pursuit of the Precious. In the first phase, Master Mega uses three simple attacks. For his first attack, he circles the player in a ring of ink around a platform (which Agent 3 stands on), occasionally sending out vertical slashes. In his second attack, Master Mega charges at Agent 3 with his mouth open, which Agent 3 can throw a bomb or Smallfry into. For Master Mega's third attack, he goes underground, creating a ring around him, similar to a Maws, which sounds an alert when Agent 3 is inside the ring. Agent 3 can drop a bomb into the ring, and Master Mega will catch the bomb.

Once Master Mega swallows a bomb, he flies onto the platform and tries to crawl back into his ring of ink, where Agent 3 can use his vulnerable state to splat him while he is crawling. Once splatted, Shiver falls off Master Mega, making her vulnerable as well.

In the second phase, Master Mega makes ink tornadoes to charge up his main attack, where he fires a beam of ink at Agent 3.

In the third phase, Master Mega fires three beams of ink at Agent 3 instead of one. Master Mega also crawls faster after swallowing a bomb.

In the Rocket Battle, Master Mega makes another appearance after Shiver lends him to Agent 3 to help them boost into space to stop Mr. Grizz.