Dee Dee is a character from Dexter's Laboratory. She is the ditzy ballet dancing sister of Dexter, who consistently gets on his nerves. The daily events surrounding Dee Dee's life mainly revolve around her relationship with her brother and everything that happens between the two. She appeared in the Christmas special, "Dexter Vs. Santa's Claws".
In "Dexter Vs. Santa's Claws", she believed in the existence of Santa Claus, and Dexter enlightened her, by telling her how illogical and made up he was. Dexter was proved wrong, but not after destroying the house and leaving Dee Dee without her presents.