South Park

Season 1, Episode 5 — An Elephant Makes Love to a Pig

TMDB episode metadata

Show: South Park

Episode title: An Elephant Makes Love to a Pig

Air date: September 10, 1997

Director: Trey Parker

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

Stan notices a new addition in their bus stop crew, an elephant standing alongside Kyle. At school, class lessons for the day involve genetic engineering (conveniently enough). Kyle questions the possibility of a genetically engineered elephant made smaller by design. The boys have to beat the rough kids in their genetics experiment, and will try anything to do it.

Source: TMDB