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As they reach the exit, Agent 8 is confronted by Agent 3, who has been brainwashed by the Telephone. Agent 8 then climbs through the depths of the facility towards the surface via a hole that Agent 3 left in the ceiling, while Cuttlefish stays behind to keep watch over Agent 3.
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However, they are rescued by Agent 3, who is promptly knocked unconscious in the process. After completing several test chambers and collecting all four thangs, which combine into a large blender, the Telephone attempts to kill Agent 8 and Cuttlefish by tricking them into getting into it. As Agent 8 clears tests in the underground facility, they obtain small items called Mem Cakes that serve as physical manifestations of their lost memories.
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Agent 8 is given assistance via radio by Pearl and Marina of the pop band Off the Hook. The Telephone informs them that in order to reach "the promised land", they must traverse through the Metro to collect four objects known as "thangs". Cuttlefish and Agent 8 are trapped in a subway-like testing facility called the Deepsea Metro, where a talking telephone identifies the player-character as Subject 10,008, prompting Cuttlefish to give them the title Agent 8. Cuttlefish was seeking out Agent 3, the protagonist of Splatoon, and decides to help the Octoling after hearing them humming the Squid Sisters' song. Players take control of an amnesiac, unconscious Octoling who is found by the character Cap'n Cuttlefish. Players access each level in the expansion through a hub world. The game is an expansion of Splatoon 2, and uses much of the same mechanics, concepts, and weapons as the main game does. Octo Expansion has players take control of an Octoling that goes by the name of Agent 8, who must complete a number of challenges in their pursuit of four particular objects.