The third and final volume of the new series of Torchwood – Aliens Among Us, sees the team facing their biggest threat so far. (And if you’ve heard the epic cliffhanger to the second volume, you’ll know what and who that is!).

“As if things weren’t bad enough for Torchwood, now they’ve got that to deal with!” says producer James Goss. “The twist was Russell (T Davies)’s suggestion – but it’s not all about that. We’ve got Joseph Lidster’s take on vigilante groups, Helen Goldwyn’s story about a quiz night run by a religious maniac, and we’ve got exploding ramblers!”

James continues: “We’ll see Captain Jack’s (John Barrowman) plans fall horridly apart, Gwen (Eve Myles) and Rhys (Kai Owen) go on a blood-soaked double date with Mr Colchester (Paul Clayton) and his husband Colin (Ramon Tikaram). Orr (Samantha Béart) tries to solve the internet, Andy Davidson (Tom Price) gets asked out for dinner, and Terence Hardiman (from the BBC's The Demon Headmaster) plays a character called Escape.”

The four tales in this finale come from writers Tim Foley, Joseph Lidster, Helen Goldwyn and producer James Goss.

5.9 Poker Face by Tim Foley

Torchwood are in trouble. Terrorist attacks are rocking the city. Control of the police has been ceded to Cardiff's alien masters. And it looks like it's all been arranged by Captain Jack Harkness.

Worse, there's a dead woman in the cells who says that Torchwood will be hers by dawn.

5.10 Tagged by Joseph Lidster

"I know what you've done. I know what you'll do."

The phrase starts appearing everywhere around Cardiff. On posters. On the internet. It's just a prank, isn't it?

Only a wave of vigilante crime spreads through the city. People are taking revenge. Suddenly everyone knows what you've done. And they know what you'll do.

5.11 Escape Room by Helen Goldwyn

Gwen Cooper, Rhys Williams, and the Colchester-Prices go to try out an escape room. They've heard a lot about them. Especially this one.

People keep going into the game and not coming out. But Torchwood will be fine. After all - partners can trust each other. Can't they?

5.12 Herald of the Dawn by James Goss

It all starts normally enough. A car park full of ramblers is incinerated by a thunderbolt.

But the next day it's clear there's something very wrong. Something's changed. Something's coming. It's the end of the world. And that's what Torchwood are best at.

Aliens Among Us Part 3 is available for pre-order on CD at £28 or on download for £25, and will be released in February 2018. Aliens Among Us Part 1 and Part 2 are also available here.

Or why not save money by getting all of Series 5: Aliens Among Us in a bundle for £75 on CD or £60 on download.