Mammoth Manny (by), Sabre-toothed Tiger Diago (by), and Sid, a sloth who is annoying but has to admit that he is a life treasure (by) After experiencing two crises of melting and collapsing glaciers, the trio of tribulations can finally rest for a while. The settled three have their own busy schedules. Manny is busy walking into the sacred palace of marriage with Ellie (by), the saber-toothed tiger has become the guardian of the entire group, and Sid is still idle as always. This time it did not know where to bring back a few big eggs. Originally Sid thought he had picked a big deal, but unfortunately he never thought of how much trouble he caused-the mother of that egg was a Tyrannosaurus rex! For the overlord of the earth in this ancient age, how could a little sloth be his opponent? Hearing the news, the dinosaur who came to retrieve his child was ready to teach Sid, who had no sense of height, so he took Sid away.
Sid's whereabouts are unknown, and several of his friends can't sit still, so he embarks on a journey to find Sid. Faced with Ellie, who is in labor, Manny wants to get Sid back as soon as possible, and then go home to take care of his little baby. And Diago, who had always suspected that he could not be a saber-toothed tiger, was determined to use this journey to prove that he was still a majestic knight. Along the way, Manny and Diago once again encountered a lot of troubles. Fortunately, they can always overcome their dangers. When they found Sid, they found that Sid was fighting with the dinosaurs. The nanny who picked up the little dinosaur is here. And Sid also led them to the magical underground world, which formed a world of contrast with the wind and snow outside. In the face of this paradise in the ice age, the trio once again experienced various adventures, and Quette, who had been aiming for acorns all his life, finally got his wish.
