The Croods and the Bettermans are back and battling over which kooky croodimal to crown “best pet” while Eep is skeptical of the farm’s newest visitor, and Gran’s feathered frenemy, Malachi. Thunk recruits Dawn on a quest for an ancient stash of legendary snacks, and Phil’s “Greatest Inventor Whoever Lived” title is tested when Grug discovers an old, subterranean cave filled with inventions far more advanced than anything prehistory has ever seen.