Transmission: 17.10.2015.

Writers: Jamie Mathieson and Steven Moffat.

Director: Ed Bazalgette.

Guest Starring: Maisie Williams; David Schofield; Simon Lipkin; Ian Conningham; Tom Stourton; Alastair Parker; Murray McArthur; and Barnaby Kay.

Captured by Vikings, the Doctor and Clara Oswald have just 24 hours to train the villagers –farmers, fishermen, and shepherds – into a fighting force. Because one of the villagers, Ashildr has declared war on the galaxy's deadliest mercenaries, the Mire.

"Now, I'm not going to lie to you," the Doctor says. "We are facing a force with vastly superior weaponry, training, armour, posture, and personal hygiene."

But the Mire bring the Vikings' God, Odin, with them... and the Vikings don't take too kindly to having their All-Father questioned by the Doctor.

Linked with next week's The Woman Who Lived, this isn't your typical two-part adventure. They have different writers, different enemies, and a mostly different cast – but one thing they do have in common is Maisie Williams. Casting of the Game of Thrones star has caused quite a media storm with everyone asking how she's connected to the Time Lord. Could she be Susan, the Doctor's Grand-daughter? Or a splinter of Clara? Or what about Romana, a much-loved former companion?

Actually, she's playing Ashildr, a spirited young villager who wants to defend her home from the would-be alien usurpers. The Doctor, however, recognises her somehow...

"It’s so refreshing to have this futuristic element linked into [the Viking setting] too; that’s what has kept me going really, not just beards and dragons," Maisie says."There’s a whole new element that’s fed in to the sides. It just looks so great with all of us in our Viking outfits, Jenna in her space suit and the Doctor in his cool coat with his crazy sunglasses. It makes for a really cool and interesting dynamic on screen."

Jamie Mathieson returns to Doctor Who, having written last year's stand-out episodes, Mummy on the Orient Express and Flatline, so we've plenty to be excited about. "It's The Magnificent Seven," he told Doctor Who Magazine. "Structurally, I realised that fairly early on. Good guys trying to train up weak villagers to fight powerful bad guys, with the clock ticking down."

Described by many as a 'romp', somewhat in the same fashion as Robot of Sherwood (2010), The Girl Who Died is directed by Ed Bazalgette, who is perhaps best-known for the stunning visuals from the hit BBCOne series, Poldark.

And to top it all off, co-writer and showrunner, Steven Moffat teases that we might just find out where the Doctor got his face from. Could this be a return visit to Pompeii?

The Girl Who Died airs on 17^th October on BBCOne at 8:20pm. Keep your eyes peeled for our review over the next few days.