Wallace Maynard Cox (December 6, 1924 – February 15, 1973) was an American actor. He began his career as a standup comedian and played the title character of the popular early U.S. television series Mister Peepers from 1952 to 1955. He also appeared as a character actor in over 20 films and dozens of television episodes. Cox was the voice of the animated canine superhero Underdog in the Underdog TV series. (Via Wikipedia)