I love this so much. The young stars of "The Brady Bunch" did a heckuva lot of cheesy movies and TV when they weren't hanging around Westdale High.
Bobby Brady got kind of the best deal--he was on "Isis." Peter got to be a werewolf on "Bigfoot and Wildboy," which I only vaguely remember. Greg did "MegaPiranha," but that doesn't really count, it was supposed to be campy. And sweet Marcia did a 1979 TV movie called "A Vacation in Hell" that looks like exactly that.
Be sure to watch the video clips provided (sadly, the Peter as a werewolf one was yanked, leaving just the still photo below) for an extra dose of '70s lunacy.