Maybe-Sitting

Maybe-Sitting is the 31st episode of Phil of the Future

Synopsis
When Phil and Keely baby-sit Nathan, the trouble-making nephew of Mr. Messerschmitt, they get more than they bargained for, so they use the New-Ager, a device that changes one's behavior. But things go hay-wire, leaving Nathan to act like an old man, while Phil is acting like a little boy. Now it's up to Keely to solve the problem before Mr. Messerschmitt and Phil's dad get home. But her only salvation, Pim, is too busy using the Wizard to create and then sell the latest school project.