South Park

Season 2, Episode 1 — Terrance and Phillip in Not Without My Anus

TMDB episode metadata

Show: South Park

Episode title: Terrance and Phillip in Not Without My Anus

Air date: April 01, 1998

Director: Trey Parker

Top billed cast: Trey Parker, Matt Stone, Isaac Hayes, Mary Kay Bergman, Mona Marshall, Jennifer Howell

The show starts off with the build up from last season's cliffhanger revolving around Cartman's paternal origins. However, just as it seems they are about to get on with the second half of "Cartman's Mom Is A Dirty Slut," they do a 180 degree turn-around and reveal that for April Fool's Day they will be showing Terrance & Phillip in "Not Without My Anus".

Source: TMDB