Lorne first appears in "Stargate SG-1" episode "Enemy Mine". Lorne reappears as a part of the new personnel sent after the Wraith siege by the "Daedalus" and serves as Atlantis' military second-in-command under Lieutenant Colonel John Sheppard. In "Runner", he assists Sheppard, Teyla Emmagan, and Rodney McKay in the search for Aiden Ford. Lorne possesses the ATA gene, but it has never been revealed whether his gene is natural or artificial. He is seen piloting a Puddle Jumper in several episodes including "Condemned" and "The Hive".