A special radio episode of sci-fi drama Torchwood is to be broadcast as part of BBC Radio 4's Big Bang experiment.
The 10 September event will see scientists recreate the aftermath of the Big Bang at the European nuclear research facility in Geneva.
Presenter Andrew Marr will report on the experiment for Radio 4 which has exclusive access throughout the day.
The episode of Torchwood will be set inside the European Organisation for Nuclear Reasearch (CERN).
As part of the day's broadcast, the show's star John Barrowman will join Ben Miller and Alan Alda on a panel of celebrities who are fans of particle physics.
The Big Bang will be recreated by the largest atom smasher in the world.
Scientists are hoping it will give them an insight into the origins of the universe and its composition.
The experiment will be launched live on the Today programme.