Philip Mantle, Britain's most renowned UFO investigator, attempts to discover what really happened that stormy night in the desert of Roswell, New Mexico in 1947

Philip Mantle recaps his 17-year investigation into the 16mm alien autopsy film unearthed in the '90s that added fuel to the Roswell mystery, and the man who allegedly discovered it

After decades of silence, startling new leaks thrust Roswell back into the spotlight

Drawing on evidence old and new, Philip Mantle casts his verdict on one of the greatest mysteries of all time - is mankind alone or are there other intelligent lifeforms out there?