Oh, baby!Barton and Nancy are supposed to be watching the neighbors' kid, but they're actually competing in the Pine Bluff skateboarding competition. So who's minding little Gilbert? Their alien clones, Beta and Gamma, that's who!

But that might not be such a good thing. Faster than you can say "mucka mucka," the neighbors' house is wrecked, Beta and Gamma are in diapers, and Gilbert is turned into a "woozie!" What's a "woozie?" Read on and find out!