This year's Doctor Who Christmas special will be a superhero crossover straight out of your fan fiction.

To coincide with the first sneak preview of Doctor Who series 10 on Twitter, showrunner Steven Moffat and star Peter Capaldi dropped by CTV's Your Morning in Canada to dish the first details of their festive episode.

This content is imported from Twitter. You may be able to find the same content in another format, or you may be able to find more information, at their web site. The #TARDIS is ready for her close-up!#BehindtheScenes on series 10…#DoctorWho pic.twitter.com/s6CiNgVTmP — Doctor Who Official (@bbcdoctorwho) October 5, 2016

The hows and whys are still being kept tightly under wraps, but the 12th Doctor will go head-to-head with a superhero played by Orphan Black, American Gothic and Shameless US star Justin Chatwin.

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(Justin Chatwin in American Gothic)

"We've got a wonderful Canadian actor - Justin Chatwin - who's in it," Capaldi beamed on Canadian TV. "He told me if I mentioned his name I'd get a free drink!"

The Time Lord continued: "[Justin's] in it, which is brilliant. We just finished filming it on Friday. It's very festive. I don't know quite what I can say about it!"

"Justin is a superhero - as all Canadians are," Steven Moffat teased.

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Even if our superhero won't be Superman, Iron Man or Deadpool, we're still betting on fireworks when The Doctor squares off with another otherworldly guardian.

Moffat has written the Christmas special, which will lead into the showrunner's final series in charge of Doctor Who.

The 12th Doctor's TARDIS is getting crowded with the arrival of new companion Bill (Pearl Mackie) and a return from the alien weirdo Nardole (Matt Lucas).

As for why Moffat is leaving Doctor Who after six years in charge, he rather heartbreakingly admitted in September: "The list of people I now miss is so long.

David Fisher ELLEMEN

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"I think that's why I have to go before I get my heart broken again. Matt [Smith]'s gone, Karen [Gillan]'s gone, Jenna [Coleman]'s gone, so it's sad."

Once Moffat bids farewell to the expanses of time and space in 2017, Broadchurch's Chris Chibnall will step up to the TARDIS control panel for future series.

Doctor Who's Christmas special is expected to air on December 25 on BBC One in the UK and BBC America in the US.

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