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Loretta Swit appeared in season 10, episode 13
Jamie Farr was in season 5, episode 2
William Christopher was in what's considered one of the best episodes, season 2, episode 7, "The Lady in the Lake"
Harry Morgan was in season 3, episode 21, which also features the mansion that Clue filmed at for some exteriors, so I'm counting this as a Kellye Nakahara episode as well
Mike Farrell played a politician in season 7, episode 5
David Ogden Stiers appeared in 3 episodes, each time as a different character. This is from his first appearance in season 3, episode 5.
Larry Linville also appeared in 3 episodes, each time as a different character, including as a detective. Here's he's with his onscreen wife, Rue McLanahan, season 1, episode 18
Todd Sussman, of PA announcer and nose-job fame, was a detective in season 7, episode 7
G. W. Bailey was in two episodes; his first was season 3, episode 22
Edward Winter was in three episodes, always as a different character. Here he's in season 5, episode 12
Marcia Strassman (Nurse Margie Cutler from season 1 of MASH) appeared in season 12, episode 15
Oh Soon-taek appeared in season 10, episode 1, after appearing in 5 episodes of MASH, including "The Bus" and "The Korean Surgeon"
Rosalind Chao (Soon-Lee Klinger) was in season 12, episode 1
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