Radio Times editor Gill Hudson:

"They are faced with their fiercest threat to date – one which throws the future of Torchwood and the entire human race spiralling into danger. Do they stand a chance of saving mankind?" Even if you've never seen Torchwood in your life, the brief description from its official website should at least make it clear that Last of the Summer Wine this is not.

"But it will be a new experience for die-hard fans, too: as well as moving to primetime BBC1 from BBC2, it's also switched from the usual 13-part weekly format to five parts to be run on consecutive nights.

"It's a trick that's been used to good effect before – last year's Criminal Justice and the recent Occupation, for example – and it's something we can expect more of. As increasing numbers of us watch what we like, when we like, 'event TV' will be needed to ensure we keep having compelling reasons to tune in on particular nights.

Not that Torchwood star John Barrowman is entirely happy. Find out why – and what it takes to produce a a drama like this – on page 14."

Captain Jack Harkness, Gwen Cooper and Ianto Jones (John Barrowman, Eve Myles and Gareth David-Lloyd) return for a new adventure in Torchwood – Children Of Earth, a five-part series for BBC One.

An ordinary day becomes one of terror, as every single child in the world stops. A message is sent to all the governments of Earth: "We are coming." But, as a trap closes around Captain Jack, the sins of the past are returning and long-forgotten events from 1965 threaten to reveal an awful truth.

Torchwood is forced underground as the government takes swift and brutal action. As members of the team are hunted down, Britain risks becoming a rogue state. Meanwhile, the mysterious and powerful 456 draws ever-closer.

Captain Jack, Gwen and Ianto are helpless as events escalate to such a degree that mankind faces the end of civilisation itself.

John Barrowman plays Captain Jack Harkness; Eve Myles plays Gwen Cooper; and Gareth David-Lloyd plays Ianto Jones. Torchwood also stars Kai Owen as Rhys Williams; Peter Capaldi (Doctor Who, Skins) as John Frobisher; Paul Copley (Coronation Street, The Bill) as Clem; Liz May Brice (Bad Girls, The Bill) as Johnson, Lucy Cohu (Forgiven) as Alice Carter; Nicholas Farrell (Casualty 1909) as Brian Green; Susan Brown (Brideshead Revisited) as Bridget Spears; and Cush Jumbo (Harley Street) as Lois Habiba.