SG-18 was one of seventeen teams taking part in an offworld SGC celebration (possibly on P2C-106), (10.06 "200"). The celebration may have been for Lt. Col. Mitchell's 200th trip through the Stargate, but in any case took place on the landmark (and meta) 200th episode of Stargate SG-1.
No other missions of SG-18 have ever been referenced on the show.
No team members listed or credited.
--Aurora 18:11, 9 March 2010 (UTC)