From Semantic Stargate Wiki
This article is about the US military Colonel mentionned by Colonel Jack O'Neill in "Secrets", but with only one "L" in his last name. For the main Stargate SG-1 character, see Jack O'Neill. For other uses, see O'Neill (disambiguation).
Biographical information
Planet of origin Earth
Nationality American
Race Tau'ri
Species Human
Socio-political information
Occupation Military
Rank Colonel
Out of Stargate universe information
First mention "Secrets"

Colonel O'Neil (with only one "L") is a US military.


Nothing is known about Colonel O'Neil but the fact that he has no sense of humour at all, according to Colonel Jack O'Neill (SG1: "Secrets").

Character's evolution

"Secrets" (1998)

When Armin Selig, an investigation journalist, is about to make public the Stargate Program, and more, to reveal what really happened a few months ago in space (SG1: "The Serpent's Lair"), Colonel Jack O'Neill tells to him to correctly spell his last name as there is another Colonel "O'Neil" with only one "L", and this one has absolutely no sense of humour.


  • It is generally accepted to say that Richard Dean Anderson (Colonel Jack O'Neill's portrayer) was making a hint to the "Jonathan “Jack” O'Neill"'s character portrayed by Kurt Russell in the Stargate original movie, a much more serious character than the one portrayed by Anderson.
  • O'Neil's nationality is deducted as he's part of the US military.