In the last few years, Robbie Williams has become obsessed with UFOs and aliens. In this Radio 4 documentary, Jon Ronson travels with him to a UFO conference in Laughlin, Nevada, where they meet a doctor who claims to own 15 extraterrestrial metallic objects, and a woman who believes her son was abducted by aliens. Robbie, it seems, doesn't share Ronson's scepticism, declaring: "I don't want to hear any debunking because I want to believe."

Robbie Williams and Jon Ronson Journey to the Other Side is on Radio 4, at 6.30pm Tuesday 6 May. The programme audio will be available on the iPlayer for 7 days after the broadcast.