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.

After Thunk and Guy tell Eep and Dawn a campfire story of Gorgwatch, a hideous monster who roams the woods, the girls are terrified.

When Eep and Dawn find a stranded egg, they eagerly take it in as their new pet, but when they learn the egg is not what it seems, they have to return it before it becomes dangerous.

When Grug thinks his forehead looks too big in Ugga's family portrait, she strives to make the painting disappear.

Tired of the farm's feud with the neighboring punch monkeys, Ugga arranges a punch summit where the Bettermans and Croods will stay in the punch monkey village to learn how to all get along.

Determined for Grug and Guy to bond, Eep plans a hunt for the three of them. But when Eep sneakily makes it appear that Guy saved Grug from a charging bearacuda, the two believe Guy is a master hunter, and head to hunt a dangerous scorpulion.

When Hope allows Dawn to borrow her favorite bracelet, Dawn is determined to prove she is responsible. But when an accident leads to the bracelet being stuck in an Eegle's nest, Dawn, Eep, and Guy must retrieve the bracelet before Hope finds out.

Each kid believes that they have the best pet on the farm, and hold a contest to prove it. Meanwhile, Phil's attempts to find a pet to enter proves dangerous, as he turns to wild animals.

Dawn is bummed when an injury prevents her from joining the Croods and Bettermans to a trip to Fizzy Falls, but when Thunk recruits her on his quest for an ancient stash of legendary snacks, Dawn can't resist joining the treasure hunt.

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.

The kids take their "Dare Game" too far, causing Grug, Ugga, Phil and Hope to forbid them from playing it. But when the adults also get hooked on the game, the kids must convince them to stop before someone gets hurt.

Phil enlists the Croods to help him retrieve a rare fruit before some wild animals can. But when Grug doesn't trust Phil's methods of getting it back to the farm, the Croods and Bettermans compete with each other more than with they did with the animals.

Hwam returns with news of a utopian cave community, accidentally reigniting the argument between the Croods and Bettermans. As the Croods journey to Caveana and the Bettermans adjust to life without them, the parents deny how much they miss each other.