The 45-minute episode, Lost Souls, was written by Joseph Lidster and stars John Barrowman, Eve Myles, Gareth David-Lloyd and Freema Agyeman.
The story is set in CERN, the home of the Large Hadron Collider, which this week will attempt what is described as the most powerful physics experiment in history. The Radio 4 website features an article on the use of CERN in science fiction, including the episode of Torchwood.
The play can be heard in the UK on BBC Radio 4 FM and around the world via the Radio 4 website. It will then be available for one week via the Listen Again feature.
Torchwood go to Geneva where Martha Jones, ex-time traveller, is now working as a doctor for a UNIT task force at the world’s biggest physics laboratory, CERN. Deep in an underground tunnel, a giant particle accelerator is about to be activated for the first time. But something strange is happening. Scientists are hearing voices and collapsing with a strange illness. Is something lurking in the underground tunnel? Do the dead ever really stay dead.