Black Ops soldier and comrade in arms with Jack O'Neill under the command of Colonel John Michaels. Thomas, along with Captain O'Neill and Charles Kawalsky, traveled to East Germany in 1982 to capture a Russian agent named Boris, who had fortified himself in a remote home.
The mission was a failure, resulting in the death of the team leader. It is not known if Thomas survived.
The Gamekeeper - Teal'c takes on the role of Thomas in the Keeper's recreation of 1982 East Germany.