Also in the ***Seinfeld ***episode “The Burning” is “Medical Student” Daniel Dae Kim, aka “Cpl Chang” on ***ENT ***and “Astronaut–Gotana-Retz” on VOY.
One more from “The Burning”: “The Doctor” Ursaline Bryant, aka “Capt Scott” in the ***TNG ***episode “Conspiracy.”
She was also in a couple of episodes of *Max Headroom *as a jr. reporter.
Looking over the full cast list for Batman, there were a LOT of actors who appeared in both. They include Grace Lee Whitney, Roger C Carmel, Lee Meriwether, Joan Collins, Ted Cassidy, Malachi Throne, Meg Wyllie, Charles Dierkop, Teri Garr, Angelique Pettyjohn, Bill Quinn, Stanley Adams, Lloyd Hanes, Billy Curtis, Marianna Hill, Nancy Kovack, and Sherry Jackson.
And Frank Gorshin.
Already mentioned.
I was watching “Shore Leave” for the first time in many years the other day. This passage caught my attention:
TONIA: He had a cloak, sir, and a dagger with jewels on it.
**KIRK: **Are you sure you’re not imagining all this?
TONIA: Captain, I know it sounds incredible, but I did not imagine it any more than I imagined he did this.
MCCOY: Sounds like Don Juan.
TONIA: Yes. Yes. It was so sort of story book walking around here, and I was thinking, all a girl needs is Don Juan. Just day dreaming, the way you would about someone you’d like to meet.
**KIRK: **Mister Sulu was with you. Where is he now?
TONIA: He ran after him.
That last bit kinda takes on a whole new meaning now, doesn’t it? 
LOL.
I was just at the Lincoln Presidential Museum in Springfield, Ill., which is worth a visit. No reference to the President’s appearance in “The Savage Curtain,” but there was a mini-theater with an interactive “Ask Mr. Lincoln” series of FAQs on everything from the Presidency, to growing up on a farm, to religion (he liked preachers “who look like they’re fighting bees”) and the Civil War. The narrator was the late William Schallert, Nilz Baris in “The Trouble with Tribbles.” He had a bit more of a Kentucky twang than the Federation bureaucrat we all saw, but you can definitely recognize his voice.
He’s normally portrayed as being more of a baritone (like Gregory Peck), but contemporary reports say Lincoln had a high, reedy voice that carried well, even in wide open spaces (like at Gettysburg).
Of course, the “Lincoln” we saw on TOS came straight from Kirk’s imagination, so he was probably influenced by watching old movies.
nm
Jennifer Savidge, aka “Fala” on DS9, as “Nurse Lucy Papandrao” in St Elsewhere.
Kavi Raz, “Assistant Chief Engineer Singh” on TNG, as “Dr Vijay Kochar” on St Elsewhere. Looking at his page at Memory Alpha, I see a lot of other Trek alumni appeared on that show:
Singh was the ultimate redshirt, even though Engineering was by this time gold: He was zapped by an alien before the second commercial break. 
Ian Wolfe, Mr. Atoz, in the Peter Gunn episode The Deep End, season 3, episode 22. He is no more believable in *Peter Gunn *than in All Our Yesterdays.
John “Mr Hengist/Jack the Ripper” Fiedler as “Fred” in Cheers’ “The Tortelli Tort.”
Carel Struycken (Mr. Homn on TNG) appears as an alien in NYC in the first Men in Black movie, which I saw again tonight for the first time in years. Still a lot of fun.
Dwight “Reg Barclay” Schultz as “Officer Carmichael” in the Hill Street Blues episode “Life, Death, Eternity.”
Ian “Mr Atoz” Wolfe as WWI vet “Buzz Crowder” in the Cheers! episode “One for the Book.”
Watching the Voyage to the Bottom of the Sea episode, Fatal Cargo, I see a white gorilla suit that looks like mogato critter sans horn from A Private Little War. It growls like a gorn. I wonder if the two shows shared a white gorilla suit and sound effects.
Don’t know about sound efx, but the suit is the same, as is the actor in it:
https://www.harpiesbizarre.com/creature.htm
-----Note #13
Thanks, Dropo!