Rodney Copperbottom is a young robot inventor who dreams of making the world a better place … until the evil Ratchet takes over Big Weld Industries. Now, Rodney's dreams -- like those of his friends, including motor-mouthed Fender -- are in danger of becoming obsolete.
With the impending ice age almost upon them, a mismatched trio of prehistoric critters -- Manny the woolly mammoth, Diego the saber-toothed tiger and Sid the giant sloth -- find an orphaned infant and decide to return it to its human parents. Along the way, the unlikely allies become friends. But when enemies attack, their quest takes on far nobler aims..