皮巴弟是一隻具有超高智慧的小狗，為了要給自己撫養長大的兒子：薛曼，一個獨一無二的禮物，他特別發明了一台時光機，並帶著他穿梭時空回到過去，體驗各年代歷史中林林總總的人事物。

不過，調皮的薛曼趁著皮巴弟不注意的時候，偷偷擅自使用時光機，結果造成時空出現嚴重的缺陷，導致過去與未來都有可能受到牽連。這下明白事情大條的薛曼，該如何跟皮巴弟聯手修補時空呢？

Mr. Peabody is a business titan, inventor, scientist, gourmand, two-time Olympic medalist and genius...who also happens to be a dog. Using his most ingenious invention, the WABAC machine, Mr. Peabody and his adopted boy Sherman hurtle back in time to experience world-changing events first-hand and interact with some of the greatest characters of all time.

But when Sherman breaks the rules of time travel, our two heroes find themselves in a race to repair history and save the future, while Mr. Peabody may face his biggest challenge yet - being a parent.