Amy and Nick are kidnapped by a cyborg from the future, a result of Jennings' misuse of Wayne's environment-friendly car.

Diane is suffering a mid-life crisis in which she tries to look younger and after a trip to the museum with her husband and son, she finds out about a spell that could make her younger. Diane translate the tablets against Wayne's wishes and unknowingly wakes up as an evil princess. Now it is up to the Szalinski team to fight the evil princess and get Diane back. Meanwhile, the chief tries to beat Wayne in a spring decoration contest.