The adventurous possum brothers Crash and Eddie, voiced by Vincent Tong and Aaron Harris, are determined to prove they can survive on their own outside their herd. Their quest for independence leads them straight into the treacherous and fantastical Lost World, a vast underground dinosaur realm. There, they reunite with the fearless, one-eyed weasel Simon Pegg as Buck Wild, who is locked in a perpetual battle to protect the valley from the tyrannical dinosaur leader, Orson. Buck reluctantly takes the bumbling brothers under his wing as they become entangled in his mission to save their prehistoric paradise from Orson’s sinister plans. This action-packed adventure, directed by John C. Donkin, delivers the franchise’s signature humor and heart as the trio navigates erupting geysers, wild creatures, and their own hilarious shortcomings, discovering that true heroism often requires an unlikely team.