Dexter's Laboratory™ #4: I Dream Of Dexter: It's a boy genius's worst nightmare.... (Free c-Toon code from CartoonNetwork.com! Details Inside.)

The Story

Oh no! Dexter's archrival Mandark is at it again. This time he's come up with a truly nefarious scheme -- he's invented a special helmet that allow him to enter and control Dexter's dreams. The boy genius fights back, and soon he and his evil archenemy are locked into a 'dream duel.' With all this dream-fighting, Dexter barely has time for his inventions -- or school (he keeps falling asleep in class). There's only one person who can save him now -- his stoopid seester, Dee Dee...