Blaze Thursday

A selection of recently declassified FBI files provides new evidence for the debate over whether alien life really exists, and theorists claim the Vatican may be hiding the truth

First-hand accounts from seasoned, decorated police officers who have had unbelievable but substantiated UFO encounters

The possible truth behind a pattern of UFO sightings near volcanos. Plus, the origin of the strange stone spheres of Costa Rica

The sighting of a UFO from the window seat of a passenger jet, a strange underwater discovery said to be a lost Japanese city and an odd series of tunnels in Brazil

Les gets invited to give a lecture at a local business school. Meanwhile, Ashley and Bobby J go to war over a collection of Nerf guns

Jeff Schwarz, aka The Liquidator, takes his place as guest auctioneer

Patrick Pecker attends the auction, fuelling his long-standing feud with Roy

Investigate 75 million years of credible evidence suggesting aliens have visited Earth. From cave drawings to phenomena in the skies

This series has followed investigators visiting the sites where unexplained incidents have been reported. Giorgio Tsoukalos looks back at the most extraordinary encounters