In an interview with
John Barrowman on
SyFyPortal site (posted 26/11/06), he comments: "I will be in [season] three of
Doctor Who," he said excitedly. "I will be in the last three episodes of four episodes, and the scripts are being written as we speak because I just got a text from Russell [T. Davies] telling me that he's finishing the script that Jack returns to
Doctor Who."
"You will never see, you will never have
Who crossing over into
Torchwood," Barrowman exclaimed. "
Doctor Who is for children, is a base for family viewing and children.
Torchwood is not. The only person that will cross at this point will be Jack going back and forth, because Jack has a different persona in
Doctor Who as he does in
Torchwood, if that makes any sense. He's darker because of his circumstances and he'll change again when [he] comes in, or he might be darker when he comes back in
Doctor Who. I dunno yet but, the Doctor will never come into
Torchwood."
Although he said that he cannot comment on his upcoming
Doctor Who episodes because they are still a work in progress, he did drop a couple of hints surrounding the rest of
Torchwood.
"I'm sure at some point whether it be in
Doctor Who or
Torchwood you'll learn all of his back history," Barrowman said of Capt. Jack. "What I can tell you is that you will learn a lot about Jack in the next few episodes and towards the end of the [season]. And also that as you've noticed in the series thus far, everybody has a secret and you're going to find out more about their secret and how things start to unravel. And that was a hint."