De Bettermans nodigen de Croods uit voor hun spelletjesavond, en Phil wil winnen en Grug haat verliezen. Wanneer de strijd losbarst, zetten Phil en Grug alles op alles.

Hope gaat haar boekje te buiten door Sandy te proberen opvoeden en Ugga neemt wraak door haar uit te dagen voor het onmogelijke: Thunk manieren bijbrengen.

Sandy is finally old enough to join Grug and Eep for the annual Daddy Daughter Day and Grug couldn’t be more excited. But when Sandy struggles to fit in with Grug and Eep’s traditions, Grug has second thoughts.

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

While the parents are away, the kids are in charge of the tree house, but when the punch monkeys invade the house, the kids find themselves out of their element.

When Phil learns no one on the farm thinks he's fun, he sets out to prove them all wrong... by building a crazy amusement park.

When the adults exclude the kids from their adult-only cave, the kids make their own much cooler cave, soon making the adults want to switch caves.

Gran announces it's time for a Thunder Sister retreat at Camp Thunder to strengthen their team building skills, but Gran takes it too far when she puts the sisters through a dangerous trial.

After a big argument between the Croods and Bettermans, the parents decide to separate the two families. Not wanting to split up, the kids try to convince the parents to make up before the Croods move off the farm entirely.