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Phil and Keely are hired to baby sit Mr. Messerschmitt’s nephew, Nathan, at Phil’s house, though his dad won’t be there to supervise. Phil promises not to use any futuristic gadgets to aid him in baby sitting, though Nathan proves too much for them to handle, so Phil discovers a loophole and has Keely use the WIZRD to make Nathan more mature, but she uses it too much and makes him like a grown man. While trying to reverse it, she accidentally hits Phil, so instead of making Nathan back to normal, she makes Phil believe he’s five years old.
Meanwhile, Pim makes volcanoes for the science fair which she attempts to sell to her peers who don’t want to make their own.
Mr. Messerschmitt: How would you guys like to make $10 and hour babysitting my nephew.
Keely: Yes...no! Darn, Sunday our house is being tented!
Keely: No, Sunday my Uncle's coming to visit. He's a clown; if he doesn't feel at home he gets pretty angry.
In the episodes prior to this Pim's Biology teacher was Mr. Angst though in this episode Mr. Messerschmitt is her science teacher and even Candida who was in her Biology class is now in Mr. Messerschmitt's class.
At the end of this episode when the vase falls over, if you look closely you can see the string that is used to pull it down.