Sid the sloth, Manny the mammoth and Diego the sabre-toothed tiger grimly realise the good life is about to come to an abrupt end as flood waters threaten their homes. However, a vulture suggests they could turn an old giant tree into a boat and make their escape, so the three friends set off in search of it. Animated adventure sequel, with the voices of Ray Romano, John Leguizamo and Denis Leary