Ice Age: The Meltdown (2006)

Manny, Sid, and Diego are currently living in a large valley surrounded by an enormously high ice wall on all sides. However, the trio discovers that the ice wall is actually a dam that is barely holding a massive body of water that could flood the valley to nearly a mile underwater. A vulture tells them that there is a boat at the other end of the valley that may save them all, but they only have three days to reach it or die. Manny is also currently worrying that he may be the last mammoth left.

During the evacuation, a glacier that contains two sea reptiles from the Mesozoic era, Cretaceous a Cymbospondylus and Maelstrom a Pliosauroidea, breaks off. When Manny is briefly separated from them, Diego and Sid encounter two mischievous opossums named Crash and Eddie who drive them nuts by playing Whac-A-Mole with them. Manny is still worried about being the last mammoth alive and his family, who had been killed by humans, but is surprised when he encounters Ellie, a female woolly mammoth who believes she is an opossum and Crash and Eddie’s adoptive sister. Sid invites her to tag along with the group to escape the flood, and she brings her brothers.