It’s history week at Pleasant Valley Elementary. Mr. Peabody has organized some very cool AND educational events. But Leo and Tia haven’t seen him since he vanished into a weird portal, along with the villainous McSticky.

When Mr. Peabody suddenly reappears, he comes bearing bad news: McSticky, has a dangerous space-time ray and he’s not afraid to use it . . . to change the course of history!

Will the Lunch Club gang be able to stop him in time?