The Go Jetters join Ubercorn in the Go Jet Academy to try out a brand new click-on: the G.O. Vac, a super vacuum that can suck up bad weather. In order to put it to the test, Ubercorn creates a small hailstorm cloud inside the dome and Lars tries to suck it up with the G.O. Vac. However, Glitch appears and tries to show off his new 'Grim-o-Freeze' and zaps the cloud. Instead of disappearing, it grows in size and ferocity, breaking the roof with a smash. The sudden change in pressure blows everyone about inside the dome and the cloud blows outside, taking Glitch and the Grimbots with it. The Go Jetters need to catch it fast so launch their brand new vehicle, the Truckster.