Octoling Invasion
From Inkipedia, the Splatoon wiki
Octoling Invasion is the eighth mission available in singleplayer Octo Valley. It is the first mission with Octolings, the Octarian equivalent to an Inkling, and takes place in a modified version of Kelp Dome, a multiplayer stage.
Octo Valley
Walkthrough
Gallery
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The opening cutscene of Octoling Invasion, showing an Octoling on the central platform.