Production is currently under way on Season 9 of BBC's Doctor Who as the show approaches the 10th Anniversary of coming back to the airwaves. Although there was a two-year gap between Season 4 and Season 5, which was Matt Smith's first season on the air, the show is more popular than ever, with new doctor Peter Capaldi starring alongside Jenna Coleman. During an interview with Radio Times, head writer Steven Moffat revealed that BBC Worldwide wants him to plan out the next five seasons of the show.

"I thought it would last ten years. I didn't think it would last ten years with BBC Worldwide trying to get me in a room to talk about their plan for the next five years! It's going to do a minimum of 15. I mean, it could do 26! That's not to say its easy. It's not easy to find new people. It's not easy to find new Doctors. That could be the danger - that you start to think that it's easy. There's nothing easy about doing Doctor Who."

He added that, while most shows experience a drop-off in ratings over the years, Doctor Who has actually become much more popular internationally, and the numbers for the U.K. episodes never slipped that much.

"Ten years on, our ratings are pretty much the same. Actually, internationally, bigger. No show does that! You're meant to go down! Doctor Who just stays. It's extraordinary! When I first took it over, the BBC said to me, 'We've done all our calculations. The ratings will now fall. Expect to lose quite a bit. We don't mind that. We're going to keep it going. So long as it's a good show we won't mind if the ratings stop being quite as amazing as they were. That's absolutely fine.' And they didn't. They pretty much stayed the same."

BBC's Ben Stephenson also revealed that the network has no plans for Doctor Who to go off the air anytime soon, teasing that it could run for another 50 years.

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"Because it's such an amazing format, because you can constantly revive it and re-imagine it, then as long as the people looking after it are passionate about it and the BBC is passionate about it, there's absolutely no reason why it can't do another 50 years."