Bartholomew J. "Bart" Simpson is a fictional character in the FOX animated television series The Simpsons. He is voiced by Nancy Cartwright, and first appeared on the Tracy Ullman Show short "Good Night". At ten years of age, Bart is the eldest child and only son of Homer and Marge Simpson, and the elder brother of Lisa and Maggie. Bart's most prominent character traits are his mischievousness, rebelliousness, disrespect for authority and sharp wit.