The writer’s first episode, ‘The Doctor’s Wife’, aired in 2011 and his second episode, ‘Nightmare in Silver’, aired earlier this month.

Asked whether he has plans for a third episode, Gaiman told Radio Times: “On the one hand I don’t have time to write Doctor Who. It doesn’t pay very well, but you also have to rewrite it and rewrite it and rewrite it and never get paid, whereas in America you get paid for every rewrite, but here you keep going till it’s done. I don’t have the time, it doesn’t pay terribly well, and there are lots of things including movies, novels, an HBO series that I should be doing…”

He continued: “On the other hand I haven’t done an episode set on Earth yet, and I haven’t created a new monster. So there are boxes left to tick.”

The writer explained: “[There are] definitely things I’d come back to. And I felt on [‘Nightmare in Silver’], more than ‘The Doctor’s Wife’, they kind of trust me. There’s a level on which they feel: his episodes are a bit mad, not like anybody else’s but it still feels like Doctor Who and it’s great fun.”

Gaiman added: “And there’s part of me that feels… I haven’t scared anybody yet. The BBC website used to mark out of ten how scary an episode would be [Fear Factor]. ‘Doctor’s Wife’ was probably only a 2, maybe a 3. The Cybermen has a few little scary bits but it’s running at about a 5 of 6. I’d love to a 9. I’d love to do something that sends adults behind the sofa too and makes them wee. Pools of wee.”

Matt Smith has confirmed that he will be returning as the Doctor in Series 8 and that it will begin filming “at the end of this year or at the start of 2014”.

Series 7 concluded last weekend with ‘The Name of the Doctor’.

> Catch up on all the 50th Anniversary Special news and rumours so far in our summary.

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> Buy Series 7 Part 1 on DVD on Amazon.

Watch the Series 7 Part 2 trailer…