Dexter's Laboratory

Dexters Laboratory is about Sleep tight, America! Your fate lies safely in the hands of Dexter, a child genius who whips up dazzling, world-saving inventions in his secret laboratory.

 Big sister Dee Dee frequently wrecks his experiments, but his bigger nemesis is Mandark, his brilliant rival at Huber Elementary School.

 Mom and Dad, of course, have no idea what their little angel is up to.

I think I saw this cartoon only one time that is about it. This shows first episodes first episode was in February 26, 1995 their last episode was in November 20, 2003. The creator of this show is
Genndy Tartakovsky.