Peter Brady (center right), portrayed by Christopher Knight in the TV show, Paul Sutera in theatrical films, and Blake Foster in the TV movie, is the middle Brady son. Peter often thinks badly of himself, such as believing he has no personality in the episode "The Personality Kid". The clumsiest of the bunch, he sometimes gets overexcited and acts before thinking. Nevertheless, he is a fun-loving boy whom girls adored later in the original series. 

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He has a non-related lookalike named Arthur Owens (also played by Christopher Knight), who is shown in the episode "Two Petes in a Pod". Peter is also the only one in the family with brown eyes—all the others had blue or green eyes.