The connection to 'The Brady Bunch' may have made McCormick famous, but it might also have been her Achilles' heel. She was so closely identified with the role that she struggled to find work elsewhere when the show was over and found herself returning to play Marcia time and again in special episodes during the 1980s. She's had some small film roles, but she never achieved the superstardom that was forecast for her.
McCormick has been open about the issues she faced when 'The Brady Bunch' finished, and they will also have impacted her career prospects. She developed an addiction to both cocaine and Methaqualone shortly after the end of the show's original run and would routinely turn up for auditions on drugs and deprived of sleep. For this reason, she lost out on a part in the 1984 'Indiana Jones' movie 'Raiders of the Lost Ark.' She battled her addictions for years before getting help in the 1990s and settling down with her husband.