Robert Downey Jr is Mr Peabody January 17, 2011 Robert Downey Jr to voice DreamWorks Mr. Peabody Robert Downey Jr is prepping to work on the movie based on cartoon characters Mr. Peabody and Sherman. Entertainment Weekly report that Downey will voice Mr. Peabody in the project. Mr. Peabody and Sherman were part of the Rocky and His Friends and The Bullwinkle Show animated TV series of the 1950s and 1960s. Downey’s character has been described as an intelligent dog that travels through time with Sherman, his “pet boy”. Speaking about the character, director Rob Minkoff explained: “Mr. Peabody is this genetic anomaly. He does have brothers and sisters, all of them non-speaking, no super-smart dogs. He’s an outcast, but has overcome it by being so great at so many things”.