The sub-zero heroes from Ice Age are back on an a new incredible adventure. Scrat is still trying to nab the ever-elusive nut (while, maybe, finding true love)
Manny and Ellie await the birth of their mini-mammoth
Diego wonders if he is going too soft hanging with his pals and Sid gets into trouble when he creates his own makeshift family by hijacking some dinosaur eggs.
On a mission to rescue the hapless Sid, the gang ventures into a mysterious underground world, where they have some close encounters with dinosaurs, battle floura and fauna, run amuck and meet a relentless, one-eyed, dino-hunting weasel named Buck.