Dee Dee is a character from the animated television series Dexter's Laboratory. She is the mischievous older sister of Dexter, a young boy genius who creates a secret laboratory in his home. Dee Dee often disrupts Dexter's experiments, leading to humorous situations and chaos in the lab. In the show, Dee Dee is portrayed as playful and carefree, often engaging in activities that annoy Dexter. Despite her antics, she is a beloved character known for her silly behavior and distinctive voice. The dynamic between Dee Dee and Dexter is a central theme of the series, highlighting sibling rivalry and the challenges of growing up.