Adam can't get out of super-teen training unless he can be in two places at once, so Eddy wickedly decides to lead him astray through awareness of Donald's new cellular duplicator. Now there are two Adams. Unfortunately, Adam's clone is a perfect copy - a boy who wants a copy of himself to attend school so he can stay home. Now there are enough Adams to start a boy band and it's up to Leo to get them under control before they become an army of identical school-skippers. Meanwhile, Principal Perry monopolizes Bree's and Chase's attention by ordering them to watch over her insufferable niece, Kelly, who's as much a self-centered, domineering pain as her aunt.
—statmanjeff