Ben and his team submerse themselves into their next attempt to stop Aggregor.
Ultimate Aggregor is on Pisciss, Ripjaws' homeworld, where the second piece of the Map is located. Plumber Magister Pyke, who was after him, contacts the team for help.- All Animals Are Dogs: The alien fish that saves Kevin's life behaves like one, being overprotective of its "owner" and all. Kevin even bonds with it by the end, and is sad to leave him.
- Apocalypse How: A barely averted Class X. Pisciss is a planet, whose core is maintained by a piece of the Map of Infinity, which is used as a gravity projector. When Aggregor steals it, the planet begins to dissolve into tiny pieces. Ben barely undoes the damages when he uses Goop's gravity projector.
- Bait-and-Switch: After Kevin's helmet breaks, an alien fish jumps on his head as if it's about to eat it. It turns out that it gives him oxygen that ends up saving his life.
- Bittersweet Ending: Ben, Gwen and Kevin manage to save Pisciss from utter destruction, but they fail to stop Aggregor from obtaining another piece of the Map, who continues on his journey for the rest of the pieces.
- Didn't Think This Through: Kevin tries to fight Aggregor after absorbing metal, completely forgetting that Aggregor has Ra'ad's Shock and Awe powers and Kevin just absorbed a conductive material that would make him vulnerable to such powers. Aggregor even lampshades this.Aggregor: Next time, try absorbing something that doesn't conduct electricity!
- Giant Squid: The Rust Bucket III gets attacked by a giant alien monster that resembles an octopus. It manages to break the ship's hull as well as break Kevin's helmet.
- Not What It Looks Like: When Pyke pushes Kevin around, the alien fish starts growling like a dog and breaks his helmet. With him needing water, Kevin picks Pyke up to save him. Cue to some guards entering the room they are in and seeing Kevin holding a seemingly dead magister of the plumbers. Kevin even says it verbatim.
- Ridiculously Cute Critter: Kevin encounters an alien fish that ends up saving his life when his helmet cracks.
- Say My Name: Someone screams Aggregor's name in rage, though this time it's Kevin instead of Ben.
- Single-Biome Planet: Pisciss is a planet covered entirely by an ocean with perpetual storms.
