Bob Hilton and Art James were substitutes for Stewart for the 1980–81 season whenever he was unavailable. In 1981 Stewart was replaced as Barry & Enright lead announcer by Charlie O'Donnell, who announced for the remainder of the series' run. Johnny Gilbert and John Harlan filled in for O'Donnell on occasion. Ed MacKay, a local Los Angeles radio DJ and one-time overnight news anchor at KNX radio, announced the 1990–91 revival. Other personnel Richard S. Kline served as the director on all incarnations of the show. Music The first two seasons of the CBS version, as well as the opening of the first season of the syndicated version, used "The Savers" by Perrey and Kingsley from their 1967 album Kaleidoscopic Vibrations: Electronic Pop Music from Way Out as the program's theme music. The final CBS season instead utilized an original composition, "Joker's Jive," composed by Alan Thicke; this was also used as the closing theme during the 1977–78 syndicated season. The second syndicated season introduced a brand-new music package by Hal Hidey, including a re-recording of "The Savers" that was utilized as the opening theme. Gameplay Main game Two contestants, one a returning champion, played. The challenger began the game by pulling a lever to set a slot machine in motion. The game's slot machine consisted of three slide projectors that had been modified to use discs loaded with slides for the categories and jokers, similar to the wheels used in ViewMaster toys. The discs were spun by electric motors, and unused categories were removed from the board by shutting off the projectors for those windows. The wheels on the machine each contained five different categories, which were revealed to the contestants before the game, as well as jokers that could represent any category. After the wheels stopped, the contestant chose one of the displayed categories and was asked a question in it. If the contestant answered correctly, the dollar value of the question was added to their score. An incorrect response or a failure to answer within an unspecified time limit allowed the opponent a chance to answer and steal the money. Certain special categories gave the contestant in control a chance to win extra money, by either increasing the question value or allowing multiple questions on that turn, or involved the participation of both contestants. Question values The values of the questions were determined by the spin. Categories