Show Type: Game Show with Panel  First Telecast: February 2, 1950  Last Telecast: September 3, 1967  Producers: Mark Goodson & Bill Todman  Currently Airs: GSN, Daily at 4:30 AM EST, as part of their Black & White Overnight series.  Synopsis: What's My Line? was one of network television's longest running and most beloved prime time game shows, with a broadcast run of seventeen and one-half years. The game consisted of four panelists trying to guess the occupation of a guest contestant. As the questioning rotated, a panel member asked questions, and the guest would answer either "yes" or "no." A contestant received $5 for each "no" answer, and ten "no" answers ended the game in favor of the contestant. A mystery guest segment was also included, in which the panelists were blindfolded. The mystery guests were paid $500 as an appearance fee, whether they won or lost the game. This was in addition to the maxi