David Opatoshu, Anan 7 in “A Taste of Armmagedon”, played a shop keeper, a principal character in Time Tunnel, “The Reign of Terror”. I am reminded of “History of the World”: We do not even have a language, only thees stupid accent.
Tony and Doug are disguised in dumb looking red hats.
Everybody on Time Tunnel spoke perfect mid-20th century colloquial American English, even Israelites and Trojans. If they had gone farther into the past, Neanderthals probably would have too.
Still, that’s not quite as bad as being able to hear people talk in the vacuum of space. 
Just saw Robert Picardo (the EMH on ST:VGR) as the head of a private security firm in the 2001 Frasier episode “Bully for Martin.”
A Perry Mason wiki asks in one episode (Show 43) “Will a Perry Mason of the future defend someone from Starfleet?? Alas, none of us here will ever know.” Alas no more: in the previous episode, “The Case of the Pint-Sized Client”, Elisha Cook Jr. plays a (not-so) bad guy, and turns his life around and some nine years later defends the Captain in ToS “Court Martial”.
As an aside, in the same Mason episode, Nita Talbot, with a different hair style and color and without a Russian accent, played the wife of another bad guy. Must have been learning of US methods before being moved to Hogan’s Heroes.
I feel like we should maybe have a companion thread for “Famous(ish) actors seen in Star Trek bit parts”, as it seems a bit weird to me to have someone go and mention someone like Clancy Brown as a “Star Trek” actor seen in other stuff, when in reality, he was already somewhat well known for his roles in “Highlander”, “The Shawshank Redemption” and “Starship Troopers” by the time he was cast in a one episode role in “Star Trek Enterprise”.
I mean, nobody’s saying they saw John Cho in “Harold and Kumar” or Scott Bakula in “Quantum Leap”.
Go for it. 
Frank “Commissioner Beale” Gorshin as “Stash” in the Hawaii Five-O episode “Welcome to Our Branch Office.” Stash is part of an elaborate scheme to extort businessmen by posing as Five-O officers, a la Mission Impossible. One of the scam’s marks is named “Al Shatner.”
At one point, the real McGarrett asks “Can you believe it?” My reply was “No, I don’t believe it!”
This episode also features the old trope “We’ll drive, and you guide us along the route you followed without being able to see anything.” 
Riddle me this, Officer McGarrett!
Other Fun Facts: The casting directors were able to find dopplegangers for everyone except James MacArthur, so he had to play both the real and the fake Danny Williams.
Near the end, Gorshin’s partner (Cameron Mitchell) double-crosses him by driving off with $250,000 and leaving him in a gas-station phone booth. What does Gorshin do? He immediately rings Five-O, of course!
Mitchell had already double-crossed his other four partners after giving them first-class tickets back to the Mainland. So where does he go, now that Gorshin is left in the phone booth? To the airport, of course … where the other four partners are waiting for him after realizing they’ve been screwed!
I’ve heard of stupid criminals, but Mitchell has got to be the world’s dumbest!
They also never explained what happened to Al Shatner, who was last seen drugged and being loaded onto a boat after refusing to pay his $100,000 protection money. Whatever end he met, I’m willing to bet it wasn’t a good one. 
You don’t believe he was beamed up at the last moment?
More likely he woke up in some Asian port or was tossed overboard when pirates boarded the vessel.
He’d probably get his shirt ripped, and God help the poor pirates then.
Maybe he was able to swim to a nearby German U-boat and make a getaway.
Just saw John Fiedler as one of the Twelve Angry Men (1957):
How about one degree away? Perry Mason defends Christine White in the Case of the Curious Bride. She played Shatner’s wife in Twilight Zone’s Nightmare at 20,000 Feet. (Yeah, a bit of a stretch.)
Not bad.
Just had this pop up on YouTube, and it’s awesome:
France Nuyen (again!) in the Hawaii Five-O episode “Small Witness, Large Crime.”
Susan OLiver, who played Vina in “The Menagerie” and “The Cage”, also played the Orion Slave Girl. I am shocked that I did not realize the same actress played both parts.
Oh, yeah, the OP. She played the title role in the Wagon Train episode, “The Maggie Hamilton Story”.