Pretending the show had lasted another season . . .

One of the ones I can think of off the top of my head is Robert Duvall. He did both "Voyage to the Bottom of the Sea" and "Time Tunnel", so I think he would have been a good guest star Trek as well.

Martin Landau, possibly as a Vulcan or Romulan

I wanted to mention that Duvall also appeared in The Wild Wild West episode, "Night of the Falcon". (I've gotta get ahold of the first season's DVD set. It's finally out! YAYYYY!)

Live long and prosper.

Gene Hackman. He did an episode of Burt Reynolds' detective series Hawk in 1966. Mr. Hackman had been doing guest star roles for a few years at that point. His film career began to take off in 1967 with Bonnie And Clyde, and he never looked back. (I wonder what kind of Harry Mudd Mr. Hackman would have made.)

Martin Landau was actually Gene Roddenberry's first choice to play Spock.

Richard Basehart!

Benn wrote:

>I wanted to mention that Duvall also appeared in >The Wild Wild West episode, "Night of the >Falcon".

I really should make a Robert Duvall "the early years" compilation VHS tape. Here's all the TV episodes guest starring him I happen to have (or can easily get) copies of in either VHS or DVD format.

TWILIGHT ZONE - "Miniature"
OUTER LIMITS - "The Chameleon"
OUTER LIMITS - "The Inheritor"
THE FUGITIVE - "Never Wave Goodbye"
THE FUGITIVE - "The Brass Ring"
NAKED CITY - "A Hole in the City"
NAKED CITY - "The One Marked Hot Gives Cold"
NAKED CITY - "Five Cranks For Winter, Ten Cranks For Spring"
NAKED CITY - "Torment Him Much and Hold Him Long"
ROUTE 66 - "The Newborn"
ROUTE 66 - "Birdcage on My Foot"
ROUTE 66 - "Suppose I Said I Was the Queen of Spain?"

That's in addition to the aforementioned Voyage to the Bottom of the Sea ("The Invader") and the Time Tunnel ("Chase Through Time") appearences, which I also have on tape.

On a related note, I think I remember reading somewhere that Harlan Ellison had originally envisioned Duvall as playing the "Beckwith" character in his original script for "City on the Edge of Forever."

Gene Roddenberry to make an appearance... maybe as an admiral or some diplomat...

Raquel Welch as one of Kirk's numerous love interests, but not one that gets killed. Maybe she could've played Carol Marcus and been David's mom. Just imagine how jealous the kids in school would be of him! "Dude, your mom is soooo hot!" Not that David would care because he, you know, didn't like the ladies anyway.

William Smith(Texas Ranger Joe Riley on the TV series Laredo)as Khan if they were unable to get Ricardo Montalban for the part.

Angelina Jolie as a Green Orion Slave Girl.

Anthony Zerbe (as a villain, of course). He was on just about every other NBC show at the time, and Mission:Impossible many times.

Granted, he did finally make an appearance in Star Trek:Insurrection.

Norman Spinrad wrote a script titled "He Walks Among Us", which would have given Milton Berle a dramatic role. Supposedly, Gene Coon rewrote the script as a comedy. Spinrad hated the rewrite so much that he asked Gene Roddenberry to bury it. Star Trek - Phase II will produce the original script, which Spinrad will direct. More info on that is here.

Angelina Jolie as a Green Orion Slave Girl.

When TOS was on, Angelina Jolie wasn't even born yet!

Paul Lynde as Harry Mudd.

Roger Carmel did a great job in the role though.

I'm not sure Lynde would work as Mudd. You need an almost larger than life character. Carmel did that beautifully.

Not Classic, but the thought of Paul Lynde as a Q amuses me. ;-)

That would definitely work!

Russell Johnson, AKA The Professor, was a Trek fan, and he regretted never guest starring on Trek.

Of course, the first couple of seasons he was busy with Gilligan's Island.

"So, you say you made this starship out of coconuts?"

I can just hear Scotty: Are ye daft, Mon!? Ye canna make a starship out of coconuts! It canna be done!

Of course, the first couple of seasons he was busy with "Gilligan's Island."

There was an overlap of just one season, Tim. Gilligan's last season intersected with Trek's first. Johnson had two seasons to guest star; maybe typecasting reared its ugly head to prevent it.

And, Scotty definitely would have found a use for coconuts in engineering. Maybe the juice could soup up the dilithium crystals.

From the Nitcentral-version of 'Return To Tomorrow'

Kirk; "Scotty, they'll show us engineering marvels! Starships this size with engines made out of coconuts!"
Scotty; "Ach, yer jokin'? Of course, it might not hurt to at least look over some diagrams!"

Imagine Gilligan on Kirk's starship? (or the Skipper "...and then he whomped Kirk with his hat!").

There was an overlap of just one season, Tim. Gilligan's last season intersected with Trek's first. Johnson had two seasons to guest star; maybe typecasting reared its ugly head to prevent it.

Thanks, Adam. I wasn't sure.

Don Adams as Commodore Decker...
"We hit that thing with everything we had! And it fired back with some kind of force beam that was pure anti-proton, can you believe it? Absolutely pure!"
Kirk: "I find that hard to believe."
"Would you believe 75 % ? Howabout 50 %? Would you believe 20% and half a tank of unleaded gasoline?"
Scotty; "The Machine destroyed one warp engine, but not the other."
"Yes. Missed it by that much! If only it had used it's pure anti-proton beam for niceness instead of badness!"

Agnes Moorehead (the Patron Saint of Mothers-in-law) as Amanda? ;)

There are some that believe that Henry Winkler guest starred on an episode of TOS.

While Mr. Winkler was alive at that time (he was born in 1945), he didn't start acting until 1972, a full three years after TOS was cancelled.

Must be that Mandela Effect I've been hearing about.

It more likely that people find the idea of Winkler's character The Fonz in the world of Star Trek hilariously ludicrous so want it to be so.

I'm sticking with my Mandela Effect Theory.