What is the name of Splatoon 3's single-player campaign mentioned in Deep Cut's article?

Splatoon 3’s single-player campaign is titled Return of the Mammalians. It follows Agent 3 and the small Salmonid companion Smallfry as they investigate the disappearance of the Great Zapfish and become drawn into the secrets of Alterna.

The campaign’s title refers to the game’s central mystery: mammals were believed to have vanished from the world long ago, but Alterna reveals evidence that they survived in some form. The story also introduces Fuzzy Ooze, a fur-covered substance connected to the reappearance of mammalian life.

A common mix-up is Side Order, which is a separate single-player campaign released as the second wave of Splatoon 3’s Expansion Pass. Octo Expansion belongs to Splatoon 2, while Octo Valley is associated with the first Splatoon’s single-player mode. Deep Cut—Shiver, Frye, and Big Man—appear as bandits and recurring opponents during Return of the Mammalians.