The opening episode of Series 5 will air at 10pm on Sunday 3 February on BBC Three.

Whithouse teased: “Every year we try and up the ante. Blowing Mark Gatiss and a baby up at the end of Series 4 was good, but we could do better. We wanted to tell a story that was even greater, even more labyrinthine and epic than anything we’ve done before. Slowly a story about sacrifice and misplaced courage started to take shape. Our heroes would be driven to compromise their own fragile humanity to safeguard the rest of the world; and less scrupulous characters would endanger the lives of others in pursuit of their own agendas.”

The writer also praised the show’s cast: “Thanks to the brilliance, enthusiasm and sheer elemental talent of Damien Molony, Kate Bracken and Michael Socha; it was their skill and passion that would stop me rocking and dribbling and draw me out from under my desk to actually write the scripts.”

> Read our spoiler-free review of Series 5 Episode 1.

Are you looking forward to Series 5? Let us know below…

> Buy the complete Series 1-4 boxset on Amazon.

Watch the Series 5 trailer…