Professional game show celebrity
Particularly in the 1970s, but also in the 50s, 60s, and 80s, there were certain people who appeared as the celebrity guest on game shows very frequently.
Peggy Cass is a good example of this. Betty White spent years as such a person. For a period in the 1980s Jamie Farr became an example of this, as did Lauri Hendler and Richard Kline.
Which others could also be described as a "professional game show celebrity"? I guess it's a better fate for a performer than appearing on reality TV (hell...any fate is better for a performer than reality TV).
Have you played Atari today?