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There is the TNG episode "The Defector": In addition to his regular role of Captain Picard, Patrick Stewart also played the role of the holodeck character of "Michael Williams" from Shakespeare's Henry V, Act 4, Scene I, in the opening scenes of the episode. Stewart requested this out of his love for Shakespeare, himself a member of the Royal ...

The best I can come up with is Brent Spiner- he played Data on TNG, and appeared onscreen in three episodes as Lore, Data's brother. I'm not sure that this is far enough from the instances of clones or mirrors that you mention, but the characters exist simultaneously and have distinct personalities. This is the Wikipedia article featuring Lore, and ...

The very best I can come up with is Brent Spiner. He played not two but THREE characters in the same scene, in the 77th episode of Star Trek TNG, 'Brothers', where he appears simultaneously as Data, as Data's evil android brother Lore, and as their creator Dr Noonien Soong. http://en.wikipedia.org/wiki/Brothers_(Star_Trek:_The_Next_Generation)

Sound effects editor Douglas Grindstaff combined altered dove coos, screech owl cries and emptying balloons to create the tribble sounds. Source: http://en.memory-alpha.org/wiki/The_Trouble_with_Tribbles_(episode)

Going by this link, there have been 8 people who've been on both Star Trek and Star Wars. This link, this link and this give you the list of actors in stargate SG1 and Atlantis. Crossreferencing them hasn't given any hits so I'm afraid nobody made the crossover (and considering the current status of completion of all series, I don't think any will get the ...

It seems the answer is "no". According to IMDB, Deep Roy... ...is one of only six actors to appear in both the "Star Wars" and "Star Trek" franchises. Neither Roy, nor any of the other actors, have had a part in Stargate.

Majel Barrett played Nurse Christine Chapel throughout the original series and "Number One" in its first pilot called The Cage, which was subsequently repackaged into The Menagerie. She also was the voice of the computer on Next Generation—a triple role. Simultaneously, she was the computer voice and Deanna Troi's mother Lwaxana Troi on TNG. George ...

In addition to the answers above Robert Picardo played several different EMH characters (ST First Contact, ST Voyager). He also played the maintenance hologram for the EMH and Lewis Zimmerman on occasion. While you could argue the EMH programs are the same character Zimmerman is very different!