Crash and Eddie stumble upon the entrance to the Lost World, a vastly perfectly tropical jungle full of dinosaurs formerly thought to be extinct located underground which Ellie has forbidden them from ever visiting again, and quickly get in trouble with two raptors trying to eat them. Finding Crash and Eddie gone the next day, Ellie insists that she, Manny, Sid and Diego leave to go find them. Wanting to prove them wrong, Crash and Eddie sneak off to find a place of their own and leave the new camp. Manny gets angry with Crash and Eddie for their recklessness and irresponsibility, with him and the rest of the herd declaring they would not survive on their own. One day, they accidentally cause an avalanche and destroy the gang's summer home. The six of them have bonded to become a make-shift family. Still, Eddie and Crash act more like sons than brother of Ellie and her grouchy woolly mammoth husband, Manny, whom they have met during a devastating flood, along with Manny's two best friends, Sid, a clumsy ground sloth and Diego, a sarcastic yet altruistic saber-toothed tiger. Ellie, their adopted woolly mammoth sister, is over-protective and worries too much. They need plenty of wide-open space to practice their extreme stunts and are eager for a bit of independence. The thrill-seeking possum brothers, Crash and Eddie, have grown restless in Snow Valley.

They are rescued by their one-eyed pal, the adventure-loving, dinosaur-hunting weasel Buck Wild, and together embark on a mission to save the Lost World from dinosaur domination.' -Disney+

'Desperate for some distance from their older sister Ellie, the thrill-seeking possum brothers Crash and Eddie set out to find a place of their own, but quickly find themselves trapped in the Lost World, a massive cave underground.

Ice age: adventures of buck wild imdb