Martha Jones, ex-time traveller now working as a doctor for a UN task force, has been called to CERN. Join Captain Jack and friends in a series of strange events around the activation of the world's largest particle accelerator.
Somewhere out there in that chaos of darkness and light, of science and protons, of gods and stars and death... somewhere there's an answer.
Following the tragic deaths of two of colleagues, Captain Jack, Gwen and Ianto have to protect the human race against another unknown force from the darkness. Martha Jones, ex-time traveller now working as a doctor for a UN task force, has been called to CERN - the world's largest particle physics laboratory in Geneva - where they're about to activate the Large Hadron Collider.
The LHC is a particle accelerator, which has been built deep underground in a 27 km tunnel under Switzerland and France. Once activated the Collider will fire beams of protons together recreating conditions a billionth of a second after the Big Bang - and potentially allowing the human race a greater insight into what the Universe is made of. But so much could go wrong - it could open a gateway to a parallel dimension, or create a black hole - and now voices from the past are calling out to people and scientists have started to disappear...
Where have the missing scientists gone? What is the secret of the glowing man? What is lurking in the underground tunnel? And do the dead ever really stay dead?
Torchwood: Lost Souls
2.15pm, Wednesday 10 September, BBC Radio 4
Starring John Barrowman, Freema Agyeman, Eve Myles, Gareth David-Lloyd, Lucy Montgomery (of Titty Bang Bang) and Stephen Critchlow.
Written by: Joseph Lidster
Produced & Directed by: Kate McAll