When Eep wants alone time with her new friend Dawn, Guy seeks a new friend of his own and finds an unlikely companion in Thunk.

After a crowverine gliding mishap, Dawn loses her confidence and tells Eep she's taking a break from adventures; Eep convinces Dawn to join her on one last adventure; after a dangerous climb, Dawn realizes she never lost her confidence.

When Hope oversteps by trying to teach Sandy manners, Ugga gets her revenge by challenging Hope to do the impossible: civilize Thunk.

Ugga takes Eep to "flop with the bullruses," a fun and dangerous pastime Ugga enjoyed as a teen; Ugga's excitement fades when Hope invites herself and Dawn along; Ugga and Eep find themselves surrounded by angry bullruses.

When Phil humiliates himself playing throw-go-nut with the punch monkeys, the Croods band together to help him regain his confidence; unfortunately, Phil goes from confident to cocky and bets the farm on a game with the punch monkeys.

When Gran announces it's time to choose a new Thunder Sisters Queen, Ugga assumes she's got it in the bag; after a series of challenges called the 'Thunder Games', it becomes clear Gran might not be ready to step down.