Game 1: Bobby Nichols (as Mystery Guest #1, he signed in as Mr. X and the panel was not blindfolded) ""Professional Golfer (1964 PGA Champion)"" (from Louisville, KY; at age 16 he was in a bad auto accident, but made a comeback in golf) Game 2: Mrs. Julia S. Berolzheimer - ""Makes Shoelaces"" (she is the Vice President of her company, Diamond Braiding Mill; from Tarpon Springs, FL; such a cute contestant, she smiles all the way through her game) Game 3: Peter Lawford (as Mystery Guest #2) He signed in as ""Lassie"" which might be a reference to the episode of July 12, 1964 when Arlene said of the mystery guest, ""Let's face it, he's either a doctor, a lawyer, or a dog."" A second explanation was submitted below, which explains that this also may have been referring to Lawford's starring role in the 1945 film, ""Son of Lassie"".
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Ready to Watch Whats My Line, Season 15, Episode 48?