Nancy Campbell Cartwright (born October 25, 1957) is an American film and television actress, comedian and voice artist. She is best known for her long-running role as Bart Simpson on The Simpsons. She is also the aunt of pop star Sabrina Carpenter.
Dr. Homer Simpson subjects himself to high levels of gamma radiation which triggers his transformation into a huge cartoon character, the Angry Dad, whenever he experiences negative emotions such as anger.
