Mr. Peabody's niece Penny is visiting the museum for the night. She seems nice, but can she be trusted with all of the museum's secrets?

When a cooler, more confident Dudley dives headfirst into a dangerous mission, Ridley and the Eyes follow him to the Arctic to make sure he's OK.

Dante leads the team on a dino-tastic adventure: freeing a mama stegosaurus' tail from a fallen rock and rescuing her stolen egg from rascally raptors!