A dog named Mr Peabody has a super natural gift of anthropomorphic capability. He has adopted Sherman a 7 year boy. Mr. Peabody teaches Sherman to use a WABAC – a time machine to travel through the History. Together they go to Marie Antoinette in the time of French Revolution in the year 1789. Mr. Peabody gets caught in the Reign of Terror and is about to be killed by Maximilien Robespierre. But Sherman reaches on time and helps him escape from the place.
They both go through the sewers of the Paris city to go away. In the present time, Sherman is schooling at Susan B. Antony School located in New York. He has a fight with Penny Peterson on the anecdote of George Washington’s cherry tree. Penny gets angry and choke hold him in the cafeteria. Principal Purdy calls Peabody and tells him that Sherman has bit Penny. Child Protective Services agent Ms. Grunion also confronts him that Sheman’s behaviour is not as expected as he is raised by a dog.