Jack Harkness
Overview
Captain Jack Harkness is a fictional character played by John Barrowman
John Barrowman
John Scot Barrowman is a Scottish-American singer, actor, dancer, musical theatre performer and media personality. Born in Glasgow yet growing up in Illinois after his family emigrated to the United States when he was eight years old, Barrowman was encouraged to further his love for music and...

 in Doctor Who
Doctor Who
Doctor Who is a British science fiction television programme produced by the BBC. The programme depicts the adventures of a time-travelling humanoid alien known as the Doctor who explores the universe in a sentient time machine called the TARDIS that flies through time and space, whose exterior...

and its spin-off series, Torchwood
Torchwood
Torchwood is a British science fiction television programme created by Russell T Davies. The series is a spin-off from Davies's 2005 revival of the long-running science fiction programme Doctor Who. The show has shifted its broadcast channel each series to reflect its growing audience, moving from...

. He first appeared in the 2005 Doctor Who episode "The Empty Child
The Empty Child
"The Empty Child" is an episode in the British science fiction television series Doctor Who, which was first broadcast on 21 May 2005. It is the first of a two-part story. The concluding episode, "The Doctor Dances", was broadcast on 28 May...

" and reappeared in the remaining episodes of the 2005 series
Doctor Who (series 1)
The new first series of British science fiction series Doctor Who began on 26 March 2005 with the episode "Rose", which marked the end of the programme's 16-year absence from episodic television following its cancellation in 1989, and aired its finale episode "The Parting of the Ways" on 18 June 2005...

 as a companion
Companion (Doctor Who)
In the long-running BBC television science fiction programme Doctor Who and related works, the term "companion" refers to a character who travels with, and shares the adventures of the Doctor. In most Doctor Who stories, the primary companion acts as both deuteragonist and audience surrogate...

 of the ninth incarnation
Ninth Doctor
The Ninth Doctor is the ninth incarnation of the protagonist of the long-running BBC television science-fiction series Doctor Who. He is played by Christopher Eccleston....

 of the series' protagonist the Doctor
Doctor (Doctor Who)
The Doctor is the central character in the long-running BBC television science-fiction series Doctor Who, and has also featured in two cinema feature films, a vast range of spin-off novels, audio dramas and comic strips connected to the series....

. Jack became the central character in the adult-themed Torchwood, and returned in the 2007 series
Doctor Who (series 3)
The third series of British science fiction series Doctor Who was preceded by the 2006 Christmas special "The Runaway Bride". Following the special, a regular series of thirteen episodes was broadcast, starting with "Smith and Jones" on 31 March 2007...

 of Doctor Who, reuniting with the tenth incarnation
Tenth Doctor
The Tenth Doctor is the tenth incarnation of the protagonist of the long-running BBC television science-fiction series Doctor Who. He is played by David Tennant, who appears in three series, as well as eight specials...

 of the Doctor, and again for the 2008 series
Doctor Who (series 4)
The fourth series of British science fiction television series Doctor Who began on 25 December 2007 with the Christmas special "Voyage of the Damned". Following the special, a regular series of thirteen episodes aired, starting with "Partners in Crime" on 5 April 2008 and ending with "Journey's End"...

 and a 2010 special
The End of Time
The End of Time: The Next Revolution in Our Understanding of the Universe, also sold with the alternate subtitle The Next Revolution in Physics, is a 1999 science book in which the author Julian Barbour argues that time exists merely as an illusion.-Auto-biography:The book begins by describing how...

.

In the programme's narrative, Jack begins as a time travel
Time travel
Time travel is the concept of moving between different points in time in a manner analogous to moving between different points in space. Time travel could hypothetically involve moving backward in time to a moment earlier than the starting point, or forward to the future of that point without the...

ler and former con man
Confidence trick
A confidence trick is an attempt to defraud a person or group by gaining their confidence. A confidence artist is an individual working alone or in concert with others who exploits characteristics of the human psyche such as dishonesty and honesty, vanity, compassion, credulity, irresponsibility,...

 from the 51st century.
 
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