"Mr. Peabody & Sherman" first known as "Peabody's Improbable History" first aired in 1959 in the "Napoleon" episode . This was the 2nd episode of season 1 of "Peabody's Improbable History" which was part of the "Rocky and Bullwinkle" cartoons which aired from November 19, 1959 - June 27, 1964 .