Jack Harkness (Donna's World)

"Captain Jack Harkness" had his life changed for the worse on 25 June 2007, when Donna Noble turned right instead of left; this small change in affairs produced Donna's World.

Jack, along with Gwen Cooper and Ianto Jones, boarded the Sontaran command ship. They successfully cleared Earth's atmosphere of ATMOS gas, but in the process, Jack lost his teammates and was transported to the Sontaran homeworld. (TV: Turn Left)