Ona Grauer
Ona played Ayiana in the Stargate SG1 episode Frozen and returned as the same character for a brief cameo in the Atlantis pilot Rising, later she played Emily Young in four episodes of Stargate Universe. Ona also guest starred on Arrow, Archer, Smallville, The Whispers, Supernatural and starred in The Collector and Intelligence. IMDB
James Parks
James played Pharrin in the excellent episode Lifeboat in the seventh season of Stargate SG1. He has also guest starred on Enterprise, True Blood, Babylon 5, JAG, 24, Deadwood, Machete and Buffy. IMDB
Chilton Crane
Chilton played Sheila Jameson in the Stargate SG1 episode Ex Deus Machina as well as appearing on Shattered, The 4400, Fringe, Travelers, Smallville, Supernatural and Signed, Sealed, Delivered. IMDB Twitter