Scrat is still trying to nab the ever-elusive nut and in the process may find his true love; Manny and Ellie await the birth of their mini-mammoth; Diego, the saber-toothed tiger, wonders if he's growing too 'soft' hanging with his pals; and Sid the sloth 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...

When a new threat emerges that puts both Bird and Pig Island in danger, Red, Chuck, Bomb, and Mighty Eagle recruit Chuck's sister Silver and team up with pigs Leonard, his assistant Courtney, and techpig Garry to forge an unsteady truce and form an unlikely super-team to save their homes.

Four animals trying to save themselves from the upcoming Ice Age become unlikely heroes. The four reluctantly come together when they have to return a human child to its father while braving the deadly elements.