Steve Martin in The Jerk, that wild and crazy guy , Steve Martin, makes his film-starring debut in this wild and crazy comedy hit The Jerk. Steve potrays Navin Johnson, adpted son of a poor black sharecropper family, whose crazy inventions lead him from rags to riches and right back to rags. Along the way, he's smitten with a lady motorcycle racer, survives a series of screwball attacks by a deranged killer, becomes a millionaire by inventing the "Opti grab" handle for eyeglasses- and shows why he's one of the hottest comic performers in America today.