I've Got A Secret aired weekly on CBS from June 19, 1952 until April 3, 1967. Garry Moore was the original host, who would introduce a guest that would whisper a secret into Mr. Moore's ear. The studio audience and the home audience would see the secret, but the four member panel would not. Each panel member had 30 seconds to ask yes or no questions of the guest, and try to guess what the secret was.
So far I have only found one episode, from February 1956, featuring Lucille Ball as a guest panelist.