Phil and Guy try to disprove the Croods' belief that leaving offerings to the fire moon will prevent bad luck. But when their efforts seem to cause a series of mishaps, they'll have to retrieve the horn of a dangerous ramaconda to turn their luck around.

An attempt to fix a broken vase leaves Guy and Hope stuck together with glue. Guy's ability to stay calm is tested when Phil is too busy to help, and the other farm residents also get stuck.