The Ice Age Adventures of Buck Wild

Two opossums, Crash and Eddie, decide to run away from their sister Ellie and start an independent life, but accidentally fall into the underworld of dinosaurs. Lost in the labyrinths of the kingdom, the heroes meet the familiar caress-adventurer Buck, in whose head live several personalities. The characters have to not only unite, but also stop a dangerous enemy - Protoceratops Orson, who dreams of settling long-standing accounts with a fluffy adventurer.