Christopher Knight, more recently of "Celebrity Circus", played Peter on this classic family sitcom
The ABC Saturday Superstar Movie (1972) ... 
Celebrity Circus (2008) [DOC] [TLE] News Archive 4th July 2008 | Contactmusic.com [PAR] Jul 4, 2008 ... News Archive 4th July 2008 | Celebrity Gossip | Music and Movie News ... Former 
THE BRADY BUNCH star CHRISTOPHER KNIGHT has been forced to pull out of 
U.S. reality TV show CELEBRITY CIRCUS after breaking his arm.