A scientist and dignitary from Kelowna, one of three nations on the planet Langara (original Earth designation: P9Y-4C3), Quinn was present at the accident that gave Dr. Daniel Jackson a fatal dose of radiation poisoning. Initially involved in a cover-up, Quinn later made amends by smuggling to Earth a small amount of the unstable yet powerful element Naquadria (a derivative of Naqaudah) for SGC to study in the hopes of developing shared defense technology. For his actions, his homeland initially branded Quinn a traitor. Quinn, who has a metahuman capacity for absorbing knowledge, replaced the "Ascended" Dr. Jackson on the SG-1 team. With changes in the political winds, however, his homeland and birthright called him back. His former teammates joined him afterward on a mission to save his planet from nuclear destruction.
Corin Nemec's acting career spans nearly two decades and began with a guest appearance on Sidekicks and a season on the popular series Webster, playing Nicky Papadapolis. Born Joseph Charles Nemec IV in Little Rock, Ark., he grew up in Atlanta. Nemec came to prominence when he was cast in the 1988 film Tucker: The Man and His Dream, directed by Francis Ford Coppola and produced by Coppola and George Lucas. He then starred in and received an Emmy nomination for his chilling performance in the acclaimed missing-child miniseries I Know My First Name Is Steven. Corin also received critical acclaim in the Television Critics Association's 1989 award-winner for best movie, miniseries or TV special, What's Alan Watching?
Nemec gained popularity in the United States and Europe for his portrayal of high school's coolest prankster in the cult-hit Fox series Parker Lewis Can't Lose. He also starred in a number of network telefilms, including My Son Johnny, For the Very First Time and Summer of Fear. Nemec tackled the role of bad guy Harold Lauder in the miniseries Stephen King's The Stand, receiving excellent notices. He also starred with Jeanne Tripplehorn in the telefilm My Brother's Keeper, directed by John Badham.
Nemec previously had worked with hit-maker Badham (Saturday Night Fever, WarGames, Stakeout) in the action film Drop Zone, starring Wesley Snipes. Nemec co-starred in the Disney Vietnam comedy Operation Dumbo Drop and the Vietnam drama The War at Home. Some of his other film credits include Solar Crisis, directed by Richard Sarafian, and the independent films The First To Go, Killer Bud, Foreign Correspondents and Free. He played the recurring role of Derrick Driscoll on Beverly Hills, 90210, and recently guest-starred on the WB's Superman series, Smallville.