Christopher Knight, more recently of "Celebrity Circus", played Peter on this classic family sitcom
Totally Tracked Down  
Christopher Knight: Hardly a Brady Family(Season 1, ... From Surreal Life to 
Celebrity Circus, Christopher "Peter Brady" Knight has been all over... [DOC] [TLE] Christopher Knight List of Movies and TV Shows | TVGuide.com [PAR] Christopher Knight full list of movies and tv shows in theaters, in production and 
... More; News & Features ... Brady Bunch 35th Anniversary Marathon (TV Show) 
Peter Brady.