This one's a real treat-- this must be one of the earliest appearances, perhaps the very first, by Betty White on a game show. Later she practically had a second career in game shows, a perennial guest on Password and virtually every other game show that featured celebrities from the 1970s on.

MYSTERY GUEST: Arnold Stang (comic actor and cartoon voice artist)
PANEL: Dorothy Kilgallen, Fred Allen, Betty White, Bennett Cerf

Fans of Betty White (and who isn't?) might want to check out this playlist of all the eps of WML and TTTT she appeared on. All her WML shows are already posted, but there are new TTTT shows being added all the time!    • Betty White on What's My Line & To Te...  
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