In conjunction with tomorrow’s American debut of “Doctor Who: The Next Doctor,” the first of five “Doctor Who” specials that will conclude the tenure of both star David Tennant and producer Russell T. Davies (you can read my review here), I spoke with Davies about saying goodbye to the character he helped resurrect, and about the upcoming miniseries “Torchwood: Children of Earth,” which BBC America will be airing July 20-24.

Davies called me as I was finishing up the third episode of “Children of Earth” — an exciting, epic story in which Captain Jack Harkness (John Barrowman) and his team deal with alien invaders who can make our world’s children do whatever they want — and so our discussion begins with that.

What was the impetus behind telling this particular “Torchwood” story?

The main impetus came because in Britain, we were shifting channels. We’d been on a smaller channel as a sci-fi cult show, but this is moving it onto BBC1. It’s the main primetime channel, so we needed to do something bit. Also, although I created “Torchwood,” I’d been away from it for a while. I wanted to do something new, a different type of storytelling, to give it a big kick and stretch myself as well. So all of that thinking led to a new format. They’ve been doing this (miniseries) format quite a bit in Britain, where you’ll do five shows in five nights. It’s a new form of storytelling that I loved, and when the offer came to make “Torchwood” part of this five nights a week thing, I jumped at it. I loved it.

So do you think, if BBC orders another series, you’ll stick with this format?

I think it’s hard to revert to the previous format having done this, but if BBC1 says, “We want to do 13 weeks like before,” of course we’re going to do 13 weeks. We can do all sorts of things. The six-part weekly thriller is another standard British format that we haven’t tried yet. That’s what’s nice in this digital world: the platforms change, the digital tier gives you new options, and “Torchwood”s been at the forefront of it, since we started on a digital channel.

“Children of Earth” seems more epic, both in its scope and in the production values, than anything you did in the first two series.

Glad you said so. That was the aim. “Epic” was one of the keywords that we used. And it’s quite important for newcomers to the show to know they can watch it from scratch. We’re going to give them this big huge story where they can understand everything important in the first five minutes and go from there. I love telling stories about scale, and it’s a big international story. But at the same time, even if you make things epic, no matter how big the threat is, you’ve got to have great characters, great actors at the center of it, so everything works on a personal level. So we’ve got John Barrowman doing wonderful work as Captain Jack, Eve (Myles) as Gwen Cooper, and everyone.

But when you’re making an event, five nights a week, it would be wrong to tell a small, detailed domestic story. It’s a brilliant production team, because we didn’t have any increase in budget. It just looks like we did because they simply worked like dogs. The cast have worked hard, and it’s made by people who love this, and with real passion. And the end result shines through.

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