John Charles Daly
Daly's first foray into television was as a panelist on the game show "Celebrity Time". This led to a job in 1950 as the host and moderator on a new panel show produced by Goodson–Todman, "What's My Line?" The show lasted 17 years with Daly hosting all but four episodes of the weekly series.
Mystery!
The first host of the show in 1980 was the NBC Today Show arts editor and film critic Gene Shalit. In the first broadcast, February 5, 1980, Shalit opened with the introduction: “Good evening. We’re about to set out on a series of entertaining mysteries—15 weeks of suspenseful, sophisticated, crafty conundrums that are darkly diabolical or amusing adventures with introductions that suddenly seem alarmingly alliterative.” Shalit left the show in 1981.