Jackson makes a cameo appearance in the pilot of "Stargate Atlantis", "Rising", where he assists Rodney McKay and Elizabeth Weir on the Antarctic Outpost, unearthed in "SG-1"'s season 7 finale, "Lost City". Here, he helps them to persuade Jack O'Neill to green-light the Atlantis expedition. Furthermore, he makes an appearance in the season 5 episodes "First Contact" and "The Lost Tribe" where he visits Atlantis to study the ancient scientist Janus. Whilst there he and McKay are captured by a rogue branch of Asgard, who wish to use them to activate the "Attero Device" to neutralize the Wraith threat in the galaxy but with the unforeseen consequence of destroying the Stargates which would explode, killing tens of thousands of innocent people.