Wendy Testaburger is a fictional character in the animated television series South Park. She is best known for her on-again, off-again relationship with her boyfriend Stan Marsh, and for being more intelligent and mature than most children her age, which finds expression in her activism 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, but had previously been voiced by three different voice actors in the show's run: Mary Kay Bergman, Eliza Schneider, and Mona Marshall.