Richard Hammond - TV presenter and self-confessed mystery addict - is on a quest to uncover the truth behind the rumours and whispers around some of the world's strangest alien encounters.

Have you ever spotted a UFO? Are you in danger of alien abduction? And what did happen at Roswell?

Don't miss this instalment in the incredible series by Britain's best-loved TV personality. Explore the world's greatest mysteries - all from the comfort of your armchair!

Richard Hammond is internationally famous for co-presenting Top Gear; he also presented Brainiac: Science Abuse, Should I Worry About...? and Time Commanders, and he was a team captain on the BBC2 quiz show, Petrolheads. He writes a weekly column in the Daily Mirror.