The boys discover a man that has been trapped in the ice since 1996... in 1999. He's prehistoric man.
Added:

South Park Season 2 Episode 18 Quotes

(As Steve Irwin) Look! A king croc! (Walks up to a cow) Now, what I'm going to do, is jam my finger up it's... (The cow sits on him, then gets up, with Cartman stuck in his butt) Hey, get me outta here! Huh, kinda smells like Kenny's house in here!

Cartman

Stan: Oh my god, they revived Gorac!
Kyle: You bastards!