Anyone know the best strategy for finding actors who played multiple roles across different Star Trek episodes?

I just got finished re-watching the entire DS9 series. It inspired me to go through the TNG series. Every now and then on the show, I’ll see actors playing bit parts or extras who ended up being featured characters later on. I just saw an episode where an unnamed Romulan was very obviously played by the same actor who was Gul Dukat. on DS9. I see several actors being recycled all over the series. It was very cool to see Chief O’Brien on the pilot episode, but he was just some random bridge officer.

I love noticing and seeing stuff like this. I tried Googling to see if there was a comprehensive list of recycled actors on the show. The closest thing I could find was a dead link to some long gone Star Trek Wiki. I could find lots of quizes I could take, but I find that too tedious to go through the quiz just to see the answer.

I also saw some links to Star Trek boards and there were threads several years old where people were talking about this subject. But because I’m not a really rabid fan, I couldn’t follow some of the conversations well. I don’t know the names of actors or minor characters at all, so seeing “Fred Smith played Vignot in EP 355 and then he was Wooboo in EP 483” I would like something a little more explanatory – maybe with pictures or links so some doofus like me who has no idea who Fred Smith is, but I recognize his face from some other movies or shows could see him and see that while I didn’t remember the name Vignot, I could remember the episode with the two headed green furry guy who tried to eat Data’s cat. (completely fictional information, FYI)