That looks like it could be James Doohan.

Yes that's him.

What episode was he in?

Re: 🌟 Star Trek, TOS 🌟
 

That's Dan Duryea's son Peter, he was at helm on the first pilot The Cage.

Correct!

I also remember Peter Duryea from the dreadful movie Catalina Caper. It made for a good MST3K episode, though.

I'll do one. What episode is he in?

https://i.imgur.com/7XySODE.jpg

A Piece of the Action. Vic Tayback played Jojo Krako.

Correct! Loved him in that part.

Yeah he was good. He was an Al Capone type. I remember him also from Alice.

Re: 🌟 Star Trek, TOS 🌟
 

Good guessing Mes. I could hear his voice in my head, but I just couldn't remember what episode he was in.

You mind your place, mister, or you'll be wearing concrete galoshes.

Ha, that's a great line, always loved it!

What episode was he in?

I just found this interesting talk between Siskel and Ebert on Star Trek IV

https://www.youtube.com/watch?v=EO-4cQwjLiU

Was he in the episode with the invaders from the Andromeda galaxy?

No. That's not him.

@gbgoodies surely you know who this is, yes?

He looks familiar, but I can't seem to place him. (For some reason, I think maybe he was older when he was in "Star Trek" because when I stare at that picture, I keep thinking he should have gray hair.)

I thought of the answer last night at 3 am, because I couldn't sleep...I'm pretty sure that's Captain Garth aka Lord Garth from Whom Gods Destroy.

I think you're right. That would explain why I kept thinking he should look older.