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As the future of the human race hangs in the balance, Torchwood faces death and destruction and battles to protect the human race. After the potentially apocalyptic encounter, will Torchwood and the human race ever be the same again?

"Anybody who loves science fiction or a good drama will fall in love with Torchwood," says John. "It's action-packed, it's sexy, it's exciting, it's an emotional roller-coaster and you just want to sit back and get ready for the ride of your life."

Torchwood are a team of people who are fighting for the best interest of humanity; they are no strangers to the daily threat alien forces pose to the safety of the Earth. But, this time, they must fight with every ounce of instinct and energy they have to survive.

Of the new format to this year's series, John Barrowman, who plays lead character Captain Jack Harkness, says: "It's changed in the respect that in series one we were crawling, series two we were walking and now series three we're running.

"We know what Torchwood is and we know what it's about – it's full of drama and action.

"This storyline is one of the darker Torchwood storylines. Every time you turn a corner you don't know what's going to happen. And when you watch episode one you're going to want to see two, and when you've seen two you'll want to see three. You're just going to want more and more and more.

"You'll learn a lot about the characters in ways that you've never known them before. If you like relationships then you're going to see the difference in Jack and Ianto's relationship and Gwen and Rhys's – but you're also going to see the similarities.

"The characters have evolved in ways because we're learning new things about them. It makes it really interesting for us to play as actors, and for the audience every episode will bring a new revelation."

The new show format is also something John thinks will prove entertaining to the audience.

"I think the one storyline works perfectly for this series – it's epic, it is pacy."

The series will also reveal that one of the Torchwood team is hiding a dark secret – a potential catalyst for even more action-packed drama.

"One of the team is hiding a secret that will be a revelation to a lot of people – not only to the viewers watching but to the team itself. It will be very uncomfortable for the characters. And people watching it will question why they did it. Will they be able to understand why they did it?

"But, as in all things with science fiction, as a series, we can touch on subjects that are not touched upon in a number of other dramas."

The new threat faced by the team takes on a sinister theme using the children of Earth as a conduit.

"Anything that involves children doing stuff they are not supposed to be doing is creepy," says John. "I let my parents watch episode one and two with me, and watched their reaction. Normally they would get up during a show and have a drink or go to the bathroom, but they didn't move. My mum and dad – who are my biggest critics – were glued to the screen.

"We finished watching it and the following morning my dad turned to me and said: 'When are we watching three?' If they don't like something I do then they will say it. They absolutely loved this."