Did you wonder why the Doctor never called on Captain Jack for help in the mid-season finale, A Good Man Goes To War? Steven Moffat has the answer as he talks Doctor Who and Torchwood with TVLine.

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“I’d have brought back Captain Jack for ‘A Good Man Goes To War,’ because it’d be obvious for him to call upon Jack in those circumstances, but John was busy doing Miracle Day,” Moffat explains. “Even if he was doing the role in Wales, that’s really hard to do.”

John Barrowman who plays the Torchwood lead, has expressed interest in returning to Doctor Who previously and now Moffat has hinted that it’s something he’d like to do when the timing is right.

“When we’ve got a good story, we’ll do it. You can’t just bring somebody back and say, ‘That’s a story.’ That’s just somebody walking through a door…. I won’t be thinking, ‘How do you bring Captain Jack back?’ I’ll be thinking, ‘You know what this needs? We need to bring Jack back for it.’”

But when it comes to crossovers, Moffat and former Doctor Who showrunner and current Torchwood writer, Russel T Davies, have both ruled out the possibility of the Doctor making an appearance on Torchwood.

“The Doctor could never go to Torchwood,” Moffat insisted. “Russell and I both agree on that. Doctor Who has a tremendous relationship with children in Britain. They’d want to watch Torchwood then, and it’s not really a children’s show.”