Paul Metcalf

Paul Metcalf, (COMIC: Traitor Black Gives In!) codenamed Captain Scarlet, was an indestructible agent of Spectrum. According to some accounts, he was a fictional character.

Biography
Captain Scarlet visited Maruthea for Bonjaxx's birthday party. As the Seventh Doctor walked past him, he was sitting next to the Hulk. (COMIC: Party Animals)

As fiction
According to some accounts, Captain Scarlet was a fictional character from the TV series Captain Scarlet. (TV: Death in Heaven) The Tenth Doctor once noted that Captain Scarlet was the only person who was indestructible, but quickly added that he didn't think he was real. (PROSE: The Pirate Loop)

When Captain Palmer introduced himself, Claire Aldwych said she didn't care if he was Captain Scarlet. (PROSE: The Shadow in the Glass) Rhys Williams (AUDIO: The Dead Line) and later Johnson referred to Jack Harkness as Captain Scarlet. (TV: Children of Earth)

Bernice Summerfield referred to the Doctor's Agent Scarlet antidote as Captain Scarlet. (PROSE: Eternity Weeps)

Behind the scenes
Captain Scarlet was the principal character of Captain Scarlet and the Mysterons, a TV series created by Sylvia and Gerry Anderson and produced by Century 21 Productions.
 * The "About the Authors" section of Short Trips: Christmas Around the World refers to writer William Potter as "putting words into the mouths of", among others, Captain Scarlet. This is in reference to New Captain Scarlet, a magazine published by GE Fabbri between October 2005 and February 2006.
 * The Indestructible Man has a number of pastiche versions of Gerry Anderson characters such as Scarlet. The title character, Captain Grant Matthews (Scarlet), was reconstructed by the Myloki (Mysterons) so that he couldn't die. As a member of the organisation PRISM (Spectrum), the colour-coded officer's uniform assigned to him was scarlet. The war with the Myloki is started by Captain Karl Taylor (Captain Black) who is recreated as a Myloki agent.