On a trip to Las Vegas, Kevin, Hamster and Gretel encounter the aliens that gave them their powers and learn that much more sinister things are happening.
Hamster and Gretel must face their worst fears after battling a supervillain who can materialize people's greatest fears. Kevin and Gretel's strict grandmother comes for a visit.
When Gretel and Bailey follow reporter Veronica Hill for career day, they encounter an old foe, Van Dyke, out for revenge; Kevin and Gretel try to beat the heat at the town's newest ice cream parlor.