Read more about Captain John Hart at: Wikipedia

Official Site: BBC

Captain John Hart, played by James Marsters, is a fictional character from the BBC science fiction television programme Torchwood. He is introduced in the episode "Kiss Kiss, Bang Bang"—the first episode of Torchwood s second series. Whilst the character has not featured subsequently to the second series finale, he went on to appear in a Torchwood Magazine comic strip and Marsters has stated his interest in reprising the role on more than one occasion.

In his first appearance, John Hart is as a rogue Time Agent and former partner of the series' lead male character Jack Harkness (John Barrowman) both professionally and sexually. Whilst the original function of the Time Agency—stated to have ceased operation by the time Hart appears —is left unspecified, John's own backstory is briefly given, as well as having had a relationship with Jack he has been in rehab for an addiction to alcohol, drugs, sex and murder. John leaves earth disgraced after his initial self-interested plot is foiled by Harkness' Torchwood team, though returns in the series finale "Exit Wounds" where he is eventually given a chance to redeem himself.

The role of John Hart in Torchwood was written with the casting of Marsters in mind after he contacted the shows' producers expressing his interest in appearing in the programme's parent show, Doctor Who. The character is used to illuminate some of Jack's own characteristics as a doppelgänger who provides both an exaggerated version of, and a parallel to, aspects of Jack's persona. Both Marsters and the general media also compared aspects of Hart's character to Marster's role as Spike in Buffy the Vampire Slayer and Angel. Whilst a few reviewers criticised the character in relation to his impact of the show's tone, a larger number welcomed the character and the energy Marsters brought to the role.

Captain John Hart appears through the Cardiff space-time Rift using a Vortex Manipulator and asks Jack Harkness for help in locating three radioactive cluster bombs, apparently scattered across Cardiff. Jack Harkness tells his team that John cannot be trusted but agrees to help him. True to Jack's word, Captain John is lying and seizes the containers, trying to kill Gwen Cooper (Eve Myles) using a paralyzing lip gloss, shooting Owen Harper (Burn Gorman) and pushing Jack off the top of a building, thinking he's dead. However the containers, which are supposed to contain the location of an valuable diamond hidden by the lover he murdered, instead contain an explosive which latches on the DNA signature of her killer. As insurance against Torchwood leaving him to die, John handcuffs himself to Gwen and swallows the key. After superficially altering his DNA using that of the Torchwood staff, Jack and Owen are able to save John's life before banishing him. Spurned by his former lover, John leaves by means of his Vortex Manipulator.

Captain John Hart has not been a contender in any CBUB matches.