Ice Age

Ice Age is a 2002 animated movie about prehistoric animals going on an adventure to save a baby.

References to Ice Age on The Simpsons
Scrat makes an appearance in Treehouse of Horror XXVI where he is voiced by his original voice actor, Chris Wedge.

In Lost Verizon, the movie is mentioned by Krusty.

Scrat appears again in Eternal Moonshine of the Simpson Mind.