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Yul Brenner as the mystery challenger starts the seventh season of 'What's My Line?' with a bang, as Peter Lind Hayes joins Arlene Francis, Dorothy Kilgallen and Bennett Cerf as the weeks to begin trying to guess the line of business of a Native-America man from Oklahoma who's a Marine jet fighter pilot. Next, the panel try to guess the line of a man who runs a roulette wheel in Havana, Cuba and recently won $20 from Dorothy Kilgallen, none of the panelists identified the man. Then, Yul Brenner appeared as the mystery celebrity challenger to thunderous applause. Finally, the four panelists take a whack at guessing the line of a woman from the Bronx who takes TV survey's by means of door-to-door interviews.