10 Actors Who Have Been On Both Star Trek And Stargate

10. Colm Meany

Starting off as 'bridge officer' on Star Trek The Next Generation, charismatic Irish actor Colm Meany soon found himself in the recurring role of transporter chief Miles O'Brien, who then became Chief Petty Officer on Deep Space Nine. While his career was stellar over on Star Trek, Colm Meany also landed himself the side-gig of playing Chief Cowen (interesting rank, there) over on the spin-off to Stargate SG-1, Stargate Atlantis.

Early in Atlantis' run, the expedition ran afoul of a human race called the Genii, who presented themselves as simple farmers at first. It was soon revealed that they had a series of large underground cities and were experimenting with nuclear technology as a method of striking at the Wraith while they slept. Unfortunately, the arrival of the Atlantis personnel threw all that plan out the window and the two factions were at odds.

While the loveable Chief O'Brien was always a reassuring sight on the Enterprise or on Deep Space Nine, the few times that we got to see Chief Cowen showed just how ruthless a character Colm Meany is prepared to play.