Nicole Sullivan is an American actress, comedian, and voice artist renowned for her versatile performances in television. She first gained widespread recognition as an original cast member on the sketch comedy series MADtv from 1995 to 2001, where she created many memorable characters. Following her success on MADtv, she played the recurring role of dog walker Holly Shumpert on the popular CBS sitcom The King of Queens. Her extensive voice work includes prominent roles such as the villain Shego in Disney's Kim Possible and Marlene the otter in The Penguins of Madagascar.