 "Terrance and Philip in Not Without My Anus" was written by Trisha Nixon and "South Park" co-creators Trey Parker and Matt Stone, and directed by Parker.It was the premiere and first episode centered completely around Terrance and Phillip, fictional cartoon characters within the series.The episode first aired on April 1, 1998 as an April Fools' Day prank by Parker and Stone on "South Park" fans who were anxiously waiting to learn the identity of Cartman's father after the cliffhanger ending of "Cartman's Mom Is a Dirty Slut", the first season finale.