Theodore “Sergei Rozhenko” Bikel as “General Casimir Zipke” in the M:I episode “The Cardinal.”
I recently saw Harry Groener, who appeared in three different ST roles over the years, in Road to Perdition with Tom Hanks and Paul Newman. Scroll down for pics here.
Jon Lormer, Somers in Maverick, “Day of Reckoning” was in three Star Trek episodes. “The Cage”, “The Return of the Archons” and “For the World is Hollow, and I Have Touched the Sky”.
Roger C Carmel, aka “Harry Mudd,” as “Merle” in the Three’s Company episode “Ralph’s Rival.”
John “Kor” Colicos and Barry “Surak” Atwater in the M:I episode “The Play.”
Theodore “Sergei Rozhenko” Bikel and Samantha “Marie Picard” Eggar in the Columbo episode “Bye-Bye Sky-High IQ Club.” (This episode also features 18-year-old pre-Halloween Jamie Lee Curtis in a bit role as a waitress.)
Warren “Rojan” Stevens and Phillip “Col Green” Pine in the M:I episode “The Bargain.”
Bruce Mars is best remembered as Kirk’s annoying classmate at The Academy. I saw him in an episode of “The Lucy Show” where he had a mostly non-speaking part as a boxer.
Lucy was trying to help her florist friend, a former boxer, come up with enough money to buy the business from his retiring boss, and here scheme was going to get him into shape to take on the local hotshot ‘Sonny’ (Bruce Mars), and the prize money would be enough for a down payment.
I couldn’t find any ST connection with the actor playing the former boxer/current florist, some obscure guy named Don Rickles.
Forgive me for digressing from actors to writers.
Have Gun Will Travel: The Monster of Moon Ridge. Paladin is hired to investigate the monster, particularly the disappearance for two weeks of a young woman brain damaged from a fever, with the mental age of a small child. Paladin is captured by the monster (a Himalayan black bear, the only available trained bear available, I presume) and chained in a cave lit with a torch. A witch attempts to frighten him. Paladin, of course, quotes McBeth to the witch. It proves to be a woman hiding and caring for her son, brain damaged by the same fever. The respective parents meet and all ends well.
But again, I digress.
Written by Gene Roddenberry, and reminiscent of TOS Cat’s Paw.
Catspaw was written by Robert Bloch. A tease or compliment to Roddenberry?
Gary Lockwood, “LT CDR Gary Mitchell,” in The Model Shop (1969).
Theodore Marcuse, Korob of Catspaw in Have Gun Will Travel, The Lady.
Wikipedia says he won a silver star serving on a submarine in WWII.
I’m not sure if this has been previously covered, not sure how to search a thread for keywords. But Stargate: Atlantis had more than it’s fair share.
Robert Picardo was the head of Atlantis Season 5
Connor Trinneer was head bad guy for about three seasons
Colm Meaney was an early bad guy.
And a few guest roles here and there for others I think…
Mariette “Zarabeth” Hartley as blackmailing accomplice “Veronica” in the Columbo episode “Try and Catch Me.”
Joan “Edith Keeler” Collins, Jon “Multiple Roles” Lormer, and Logan “Proconsul” Ramsey in the M:I episode “Nicole.”
Check out this Sea Hunt knockoff from 1960:
George “Sulu” Takei, Stanley “Cyrano Jones” Adams, and Barbara “Captain’s Woman” Luna:
DeForest Kelley was apparently in another episode (“An Affair in Tokyo”), but I can’t find a clip for it. 
A quick look at the A:U full cast list shows that John “Dr Boyce” Hoyt and James “Capt Styles” Sikking guest starred in different episodes as well. (“Old Man Dies” and “Anchor Man,” respectively.)
Michael McKean (the evil clown from that VGR episode) appeared in a recent rebroadcast of Celebrity Jeopardy! from 2009. He won, beating Cheech Marin and Jane Curtin.
Susan “Mara” Howard as a panelist on Match Game '76.
Lee “Losira” Meriwether was also a panelist a couple of weeks ago, but I don’t remember if it was on MG '76 or '78.
Just saw a “Hogan’s Heroes” ep (Hogan’s Double Life) that featured John Hoyt and Malachi Throne as Nazis (Hoyt played “Dr. Boyce” in the first pilot, Throne played Commodore Mendez in “The Menagerie” which featured footage from that first pilot.)
Just saw Air Force One again (still a great thriller), and thought the actor who played the aide to the Vice President looked very familiar, but couldn’t quite place him. A little Googling revealed he’s the same actor who played the half-Romulan guy in TNG “The Drumhead.” He also, I now see, had a VGR role.
I saw DeForest Kelley in Apache Uprising last week on Grit TV.
Made a couple years before Star Trek.
He played a psycho gunman that gets beat up in several fights. He reacts by drawing a gun and waving it around. The guy finally murders a man in cold blood. I cheered when the crazy character gets killed by the Indians.
The character is constantly referred to as immature and short. I never noticed how short Deforest actually is. Next to Dhatner he looked tall.
It was quite a colorful role for Deforest. Completely different from his calm doctor on Trek.
DeForest gets a bottle shot out of his hand in the movie trailer. It’s a good movie. I enjoyed it.
