Torchwood creator Russell T. Davies has revealed that Captain Jack (John Barrowman) will be rendered mortal in new ten-part season Miracle Day.
The character has been unable to die since being killed and resurrected in a 2005 episode of parent series Doctor Who.
However, Davies told AOL TV: "The greatest thing you can do is offer a new look into the character. It's not fundamentally altering the character, it's fundamentally altering the rules [while] the character stays the same."
He hinted that Captain Jack's new condition will be linked to the premise of Miracle Day, which sees the entire populace of Earth unable to die.
"Everyone else is immortal, [and] he's mortal," explained the writer. "It's the biggest switch in the show, which we did in order to give us new insights into Jack."
Davies added that he "couldn't possibly say" if Jack will be killed off in a future episode.
"The stakes are that high," he admitted. "And it's very hard to prove he's mortal without killing him, so that's going to be interesting."
Torchwood: Miracle Day will air in July on Starz in the US and on BBC One in the UK.
Source: Digital Spy