1. Lost Souls

Outside of the government, beyond the police and fighting for the future on behalf of the human race, the Torchwood team leaves Cardiff and heads for the Franco-Swiss border, where former time-traveller Martha Jones is now working as a doctor 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 tunnel? Do the dead ever really stay dead?

Written by Joseph Lidster.

Captain Jack Harkness .... John Barrowman
Gwen Cooper .... Eve Myles
Ianto Jones .... Gareth David-Lloyd
Martha Jones .... Freema Agyeman
Professor Johnson .... Lucy Montgomery
Dr Oliver Harrington .... Stephen Crichlow
Leon Foiret .... Mark Meadows

Music by Murray Gold and Ben Foster.

Director: Kate McAll

‘Lost Souls’ was commissioned as part of Radio 4's ‘Big Bang Day’, a day of special programming commemorating the switch-on of the Large Hadron Collider at CERN.

First broadcast on BBC Radio 4 in September 2008.