Based on the characters from the Peabody's Improbable History segments of the 1960s animated television series The Rocky and Bullwinkle Show, Mr. Peabody & Sherman is about Mr. Peabody (an accomplished genius dog) and his adopted son Sherman and their adventures through time after Sherman uses Mr. Peabody's time machine, the WABAC, to impress a girl at school and accidentally rips a hole in the universe.