With all the old game shows on YouTube I've never seen, or at least remember a regular, or one-time episode TAGS cast member on a '60s-'70s game show. Match Game, various Passwords, etc.

Jim Nabors was on Celebrity Sweepstakes once

George Lindsey was on Hollywood squares 7 times, Howard Morris was on Hollywood Squares 5 times, Don Knotts was on Hollywood Squares 4 times, Jim Nabors was on Hollywood Squares twice, Hal Smith was on Hollywood Squares once,

Wally Cox, Ken Berry, Barbara Eden, George Kennedy, and Don Rickles also appeared on Hollywood squares. (one-timers on TAGS)

Thanks for the list. That's a lot. I was kind of thinking of the more cerebral shows. Would be interesting to see how their minds worked. Don Knotts in interviews seemed slow talking only in his 60s on Donahue.

Very true

George Lindsey and Jack Dodson (Howard Sprague) appeared together in a 1970 game show episode of Ralph Edwards' "It's Your Bet."

Also, Arlene Golonka (Millie Hutchins / Millie Swanson) made Hollywood Squares appearances.