Jack O'Neill

Lieutenant General Jack O'Neill is a US Air Force officer. In 1995, he leaded the First Abydos mission and defeated Ra with the help of Doctor Daniel Jackson. He retired soon after coming back home but after Apophis attack on Earth in 1997, he reactivated as a Colonel and became the first leader of Former leader of::SG-1, flagteam of Stargate Command. For seven years, he and his team managed to defeat the Goa'uld System Lords and the Replicators. After being promoted to Brigadier General in 2004, he became the head of Stargate Command for one year, allowing the settlement of the Atlantis expedition. Then after being once again promoted to Major General, he became responsible of Homeworld Command. In 2009, he was promoted to Lieutenant General.

(1995)
An officer, Major Johnson comes to Jack O'Neill's house to see him and announce that he has been reactivated in the US Air Force.

Later, at the Cheyenne Mountain Complex, Colonel O'Neill announces to Catherine Langford and her research team that he is taking over the Stargate project. After the discovery of the seventh glyph by Doctor Daniel Jackson, O'Neill leads a recon mission on the newly discovered planet on the other side of the Stargate. The first official objective is to retreive the Stargate symbols to come back home, yet when Jackson states that he cannot come back without looking for a location for the symbols, he orders the building of a base camp around the pyramid. Meanwhile, he comes back into the pyramid and sets up a nuclear warhead. After pursuing Jackson who has been dragged through the sand by a local domestic animal, O'Neill, Kawalsky and Brown discover an open mine and a tribe of locals working on the mine.

Other Jack O'Neills

 * Jack O'Neills from alternate realities:
 * Brigadier General Jack O'Neill, commander of the SGA (SG1: ).
 * Jack O'Neill, Dr. Samantha Carter's husband, killed by an alternate Teal'c (SG1: ).
 * General Jack O'Neill, still commander of the SGC in an alternate reality (SG1: ).
 * Colonel Jack O'Neill, presumed still frozen in the Antarctic outpost after the battle of Antarctica in an alternate reality where the Stargate Program is public (SG1: ).
 * Jack O'Neills from alternate timelines:
 * Colonel Jack O'Neill, retired soon after an encounter with the Aschen.
 * Brigadier General Jack O'Neill, trapped and killed in Ancient Egypt in 3,000 BC after attempting to retrieve a Zero point module (SG1: ).
 * Colonel Jack O'Neill, a retired US military coming back to SGC in order to fix the timeline (SG1:, ).
 * Major General Jack O'Neill, killed by a Baal clone.
 * Colonel Jack O'Neill, a Special Forces operative.
 * Jack O'Neills from hallucinations:
 * Jack O'Neill, in Samantha Carter's hallucination (SG1: ).
 * Jack O'Neill, in Dr. Elizabeth Weir's hallucination (SGA: ).
 * Other Jack O'Neills:
 * Jack O'Neill, a duplicate of Jack O'Neill impersonated by a Unity (SG1: ).
 * Jack O'Neill, a robot version of Jack O'Neill created by Harlan (SG1:, ).
 * Jack O'Neill, a teenager clone version made by Loki (SG1: ).