After setting aside the Omnitrix some years ago, 15-year-old Ben Tennyson discovers his Grandpa Max has disappeared. Inside Max’s RV, Ben finds a Holo-viewer with a recording from Max and he asks his cousin Gwen for advice as they meet Magister Labrid, an agent of the Plumbers and Max’s partner in a case he was working on. They go to a train station where an arms trade between the Forever Knights and the DNAliens, brokered by Kevin Levin. Ben tries to dial in his alien on his Omnitrix, but it reboots and recalibrates, giving him access to 10 new aliens. The DNAliens get away, the Forever Knights escape with one of the weapons crates, and Kevin is captured. The Plumber asks Kevin for help in finding the Knights’ hideout.