Dexter's Laboratory (commonly abbreviated as Dexter's Lab) is an American animated series created by Genndy Tartakovsky and produced by Cartoon Network Studios (also co-produced with Hanna-Barbera in 1996-2001). It is about a boy genius named Dexter, who has an enormous secret laboratory, filled with an endless collection of his inventions, which is entered primarily through a bookshelf in his bedroom. His enemy and rival is a boy named Mandark, however, Dexter feuds more often with his ditzy older sister, Dee Dee. She often gets inside the lab, playing with and often destroying Dexter's inventions or distracting him from his work. Despite Dexter's brilliant mind, his careless mistakes often cause his endeavors and experiments to result in disaster, with Dee Dee often winning.