Dexter, a boy-genius with a secret laboratory, constantly battles his sister Dee Dee, who always gains access despite his best efforts to keep her out, as well as his arch-rival and neighbor, Mandark. | Animation, Comedy, Sci-Fi & Fantasy | 6 Seasons | 78 Episodes | Series Premiere: Apr 28, 1996 | Last/Latest Episode: S06 E12 on Mar 24, 2003