Times are changing for moody mammoth Manny (voiced by Ray Romano), motormouthed sloth Sid (John Leguizamo) and crafty saber-toothed tiger Diego (Denis Leary) in this third installment of the beloved computer-animated children's franchise. Life heats up for our heroes when they meet some new and none-too-friendly neighbors: the mighty dinosaurs. High jinks and hilarity ensue in this fun family adventure that's packed with celebrity voices.