Cynthia "Cindy" Brady - née Cynthia Martin (bottom left), portrayed by Susan Olsen in the TV show, Olivia Hack in theatrical films, Jennifer Runyon in the 1988 TV movie and Sofia Vassilieva in the 2002 TV movie, is the youngest Brady daughter. She was portrayed as a naive, but occasionally precocious little girl, who was most often seen wearing her hair in pigtails and had a pronounced lisp. She frequently liked to snoop and share secrets she had found out. 

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In one episode, the family had to help her correct her habit of tattling. Cindy Brady also had various failed attempts at fame, such as attempting to break a world record for teeter-tottering, appearing on a game show (on which she suffered from stage fright and had a catatonic attack), and trying to become "the new Shirley Temple". However, she does play a pivotal role in helping Bobby meet boyhood idol Joe Namath by signing Bobby's name to a letter stating he is "really, really sick."