<Li> Ty Burrell as Mr. Peabody, a talking intelligent young dog, business titan, inventor, scientist, Nobel laureate, gourmet chef, and two - time Olympic medalist </Li> <Li> Max Charles as Sherman, Peabody's seven - year - old adopted young boy </Li> <Li> Ariel Winter as Penny Peterson, Mr. and Mrs. Peterson's daughter and Sherman's classmate </Li> <Li> Stephen Colbert as Paul Peterson, Penny Peterson's father and Patty's husband </Li>

Who plays penny in mr peabody and sherman