While Rook and Kevin are at an auto show, Ben, Gwen, and Cousin Lucy (who is the first of her kind to become a Plumber) try to find out how Psyphon's thugs are getting Level 7 Plumber technology. Gwen suspects that Lucy is the mole because of her shapeshifting abilities as a Sludgepuppy, and her love of tricks when she was younger, but it turns out that it is an old enemy: Gorvan.

Albedo (who is disguised as Ben) seeks a device that will finally change him back into his Galvan form. Meanwhile, Ben (who has been disguised as Albedo by Khyber) is locked in Plumber HQ prison. It reveals Khyber has disguised Ben and Albedo as each other for their plan to work. Meanwhile Argit claims to be the hero of Undertown after stopping the Waybads in The Frogs of War.