ANSWER
All of these people starred in TV shows or movies produced by Sid and Marty Krofft
Pryor's Place - Richard Pryor
Donnie and Marie - Donnie and Marie Osmond
Pink Lady and Jeff - Jeff Altman
Barbara Mandrell and the Mandrell Sisters - Barbara Mandrell
Raquel Welch and the World of Sid and Marty Krofft - Raquel Welch
The Lost Saucer - Jim Nabors and Ruth Buzzi
Middle Aged Crazy (movie) - Bruce Dern and Ann Margret
H.R. Pufnstuf, Lidsville - Charles Nelson Reilly
Far Out Space Nuts - Bob Denver
H.R. Pufnstuf, The Bugaloos, Sigmund and the Sea Monsters - Billy Barty
Harry Tracy, Desperado (movie) - Bruce Dern and Gordon Lightfoot
Electra Woman and Dynagirl - Deidre Hall
The Brady Bunch Hour - the original cast of the Brady Bunch (except Jan)
You could also add the following to the list:
D.C. Follies - Fred Willard
Land of the Lost (1991 version) - Timothy Bottoms
Land of the Lost (original version) - Richard Kiel
BONUS TRIVIA for Star Trek fans: If you were wondering why the original "Land of the Lost" was so good for a cheesy little Saturday morning show, take a look at the writers. Some of the better authors from the world of science fiction are represented, including many who also wrote for various versions of Star Trek:
Ben Bova
D.C. Fontana
David Gerrold
Larry Niven
Norman Spinrad
Theodore Sturgeon
