In one epic story told over five nights the new series, to be broadcast for the first time on BBC One later this year, promises to be Torchwood's greatest adrenalin-fuelled, high octane adventure yet.
Torchwood: Children of Earth re-joins Captain Jack (John Barrowman), Gwen Cooper (Eve Myles) and Ianto Jones (Gareth David-Lloyd) who are still coming to terms with the death of two of their closest friends.
Despite their pain, they have a job to do.
This time they are faced with their fiercest threat to date - one which throws the future of Torchwood and the entire human race spiralling into danger.
They battle against the odds but do they stand a chance of saving mankind?