It would be easy to just gesture vaguely at all of Sir Patrick Stewart’s career. But your question was about better performances than in Trek, and I actually think he did an excellent Picard during the original TNG run. Not quite a hot take, I know.
However, for a double off-Trek billing, I suggest Green room (2015) where he plays against Anton Yelchin among others. It’s a pretty taut little thriller about a punk band on the road that realise to their horror that their gig for the night is at a neonazi club out in the sticks. It goes downhill from there.
Oh fuck yeah. That movie was wild and Sir Patrick Stewart delivered a truly evil performance.
It’s jarring if you only know him for his cool-headed leader or mentor roles like Picard or professor Xavier… He really lets rip as this extremist POS.
I think Patrick Stewart was pretty great in that episode of Extras.
curiously, the podcast “the incomparable” made an episode exactly about this topic (more specifically, performances before their trek appearances ) https://www.theincomparable.com/theincomparable/823/
Oh fun I will have to check it out
Karl Urban was an okay Dr. McCoy, but the 157 different roles he played on Xena Warrior Princess was where he really shined the brightest.
I honestly enjoyed him more in Dredd (where he had to do more with less) than in Star Trek.
TIL!
Really only a handful, but that hilarious he had a few characters

Jeffrey Combs must have been busy.
He really did have range with them. I watched Xena when I was a kid, and I had no idea they were the same actor
Brent Spiner was brilliant in Master of Disguise, a phenomenal movie
There’s a an admiral in Star Trek Beyond that looked familiar, I had to look it up and it’s Shohreh Aghdashloo. A forgettable role, only noteworthy because I recognized the actor.
She plays Avasarala in The Expanse. Total powerhouse performance.
Damn, nearly did not recognize Keating, his performance in that gif gives heavy David Tennant to me.
He should have won best actor for his performance as “Ian” in Jungle 2 Jungle.
When I see Star Trek actors in other show I like to think “This is the holodeck”.
John De Lancie in Breaking Bad. Not that he was bad as Q, of course, but he didn’t usually have very meaty material to work with.
Mulgrew. Flemeth. (Kidding).
Levar Burton will always be reading rainbow guy, no matter what he does.
Zachary Quinto. Silar. One of the better villains, until the writers went on strike and the show fell off the rails. Granted, this likely just marks the man’s range as an actor.
John Cho. The Rise and Fall of Sanctuary Moon.
Koenig. Bester.
You could argue that everything Stewart does is equally well done. Scrooge. X. Gurney.
Andreas Katsulas had a recurring role as Commander Tomalak on TNG, but he absolutely shone as G’Kar on Babylon 5, especially in later seasons.
TIL Tomalak was G’Kar. I don’t know how I didn’t know.
He gave me goosebumps in several scenes, especially this one: https://www.youtube.com/watch?v=pJmuHNDcXLQ
I think Alexander Siddig did good in Game of Thrones. I like his acting of Prince Doran Martell.
Armin Shimmerman was just as good as Principal Snyder as he was as Quark.
I met him at a convention once and got him sign a letter as Principal Snyder, suspending my friend (who’s a huge Buffy fan) from Sunnydale High and threatening to expel her. He read it and thought it was hilarious.
That’s an awesome story and I agree he was great in that role.
Whoopi Goldberg, Sister Act II
Anthony Montgomery (Travis Mayweather) as Postmaster P in Leprechaun in the Hood

The fact that it lost to American Beauty that year is a travesty











