The sub-zero heroes from the worldwide blockbuster “Ice Age” and “Ice Age: The Meltdown” are back, on an incredible adventure…for the ages.

Scrat is still trying to nab the ever-elusive nut (while, maybe, finding true love); Manny and Ellie (voiced by Ray Romano and Queen Latifah) await the birth of their mini-mammoth; Diego (Denis Leary) the saber-toothed tiger wonders if he’s growing too “soft” hanging with his pals and Sid the Sloth (John Leguizamo ) gets in 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 flora and fauna, run amuck – and meet a relentless, one-eyed, dino-hunting weasel named Buck (Simon Pegg).