Dexter's not quite like other boys his age... he has wears a lab coat, speaks with an Eastern-European accent and has an amazing secret laboratory in his bedroom. The boy genius does share one thing in common with other boys though--an annoying older sister, although DeeDee is probably more annoying than most. She views his lab as a playground and her catch-phrase just prior to disaster is "What's this button do?" Unfortunately Dexter can't throw her out or she'll tell his crazy and somewhat oblivious parents about his secret lab. Thus we have the makings of the uneasy, tension-filled, certain-castastrophe-on-the-horizon sort of truce of most siblings... well, sort of.