Ben 10 Omniverse: Season 6, Episode 9

6 - 9: Weapon XI, Part 1

Kevin and Argit attempt to warn the amalgam kids about the Rooters' intentions before they can hunt after them. Kevin gathers Alan, and Gwen, Ben, and Rook gather Helen and Manny. The Amalgam kids learn they aren't plumber hybrids, and Kevin goes out into the Null Void alone to put an end to the Rooters, but when Ben and the gang bring the Amalgam Kids, it turns them against Ben, and later Proctor (head of the Rooters) ends up persuading Kevin into joining his side to take down Ben.