Its been a month after the trip through the WABAC and now Penny, Sherman and Mr. Peabody go off on adventures but after the Peterson's find out what she has been doing most of the time they suspend her and Sherman from seeing each other as years go on Mr. Peabody and Sherman have grown apart and Sherman has to win back the heart of Penny will he ever get his chance

As Equestira is being invaded by Giant creatures known as titans its up to the Mane 6, spike and their friends to defend Equestria before its too late