Jonathan J. O'Neill

In the original movie, Colonel Jack O'Neill is recalled to active service for a dangerous, secret mission.

Biography
Jack O'Neill was the leader of SG-1 from its inception until his promotion to Brigadier General. He was on the original expedition to Abydos with Daniel Jackson, and is now the commander of the SGC. He's a brave, irreverent, protective, skeptical, sometimes short-tempered man; an atypical but successful military leader. Together with his team, he's a bonafide hero of Earth.

His personal history is troubled: shortly before travelling through the Stargate for the first time his son was killed while playing with his pistol and, in the aftermath of this tragedy, he separated from his wife. His professional life has been adventurous. He has hinted at some of the operations in his years in the special forces: covert operations in East Germany and Iraq (during the Gulf War) have been mentioned.

Jack O'Neill is a General and leader of Stargate Command from 2004-2005. He was formerly leader of SG-1 from 1997-2004 and his service number is 69-4-141.

Jack O'Neill also naturally posses the Ancient Technology Activation Gene.

Jack has a very dry sense of humor and is impatient with complicated explanations. However, in a conversation with Samantha Carter, he explains that he is worried about her because she has not tried to baffle him with scientific babel for a few days (SG-1: Affinity).

Alternate realities

 * See Jack O'Neill (alternate)