Wendy Testaburger is a fictional character in the adult animated television series South Park. She is the primary female character in the show and has an on-and-off relationship with her boyfriend Stan Marsh. Being more intelligent and mature than most children her age, Wendy finds expression in her activism, environmentalism and feminism. Wendy debuted as a nameless background character in Trey Parker and Matt Stone's 1995 college short film The Spirit of Christmas, and made her first appearance on television when South Park initially premiered on Comedy Central on August 13, 1997, with the episode "Cartman Gets an Anal Probe". She is currently voiced by April Stewart, and has previously been voiced by three different voice actresses in the show's run: Mary Kay Bergman, Eliza Schneider, and Mona Marshall.