Lorne first made an appearance in Stargate SG:1 in an episode called Enemy Mine in Season 7 and appeared later in the episode Road Not Taken in season 10 in an alternate reality that Carter was sent to. He was later seen in Stargate Atlantis starting with season 2 episode, Runner, and has appeared in 29 episodes throughout season 2, 3, 4 and 5. He has appeared in everything from a few scenes to just appearing for a minute.It's been confirmed by Kavan Smith and Joseph Mallozzie that Lorne's first name is Evan; it has not been stated out loud as of season 5 finale, Enemy at the Gate