Wallace Maynard Cox was an American actor, particularly associated with the early years of television in the United States. He began his career as a standup comedian and then became the title character of the popular 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, including the first episode of the TV series Mission: Impossible. Cox was the voice of the animated canine superhero Underdog of the TV show of the same name. Although often cast as meek, he was actually quite athletic, as well as a military veteran.