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.

Jennings romantically pursues Diane after using Wayne's "Electric Chair of Love"; Amy and Nick contract chicken pox, forcing Diane to move into a hotel. Only one things for sure: this ain't going to end well for Jennings.

Amy's science teacher quits unexpectedly so her dad volunteers to teach. He makes a formula to make him charming so that the students will like him. Amy catches him and tries to alter the formula, however something goes wrong and the formula makes Wayne act like a bad person. Now it is up to the rest of the family to find a way to get Wayne back. Meanwhile, Diane and Nick try to give Quark a bath.