Fan Casting Ice Age (1996)

Scrat, a squirrel, attempts to find a place to store his acorn for the winter. Eventually, as he tries to stomp it into the ground, he inadvertently causes a large crack to form in the ice that extends for miles before setting off a large avalanche which nearly crushes him. He barely escapes but finds himself getting stepped on by a herd of prehistoric animals migrating south in order to escape the forthcoming ice age. Sid, a clumsy ground sloth, is left behind by his family and decides to move on by himself, but is attacked by a pair of Brontotheres after accidentally ruining their meal and making them angry. Sid is soon rescued by Manny, a mammoth heading north, who fights the rhinos off and continues on his path. Sid joins Manny, not wanting to be alone and unprotected. Manny is annoyed by Sid's outgoing demeanor and wishes to migrate on his own, but Sid nonetheless continues to follow Manny. Meanwhile, Soto, the leader of a Smilodon pack, wants revenge on a human tribe for killing half of his pack by eating the chief's infant son, Roshan, alive. Soto leads a raid on the human camp, during which Roshan's mother flees with her son. Cornered by Soto’s lieutenant, Diego, she leaps down the waterfall with Roshan. As punishment for his failure to retrieve the boy, Diego is sent to find and retrieve him while the rest of the pack waits for him at a mountain known as Half-Peak. If he fails, he will be killed in Roshan’s place.