In this 45-minute adventure, Ridley travels into the past to change the present but accidentally alters the future. Time to go back and fix it — fast!

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.