History's Greatest Mysteries 7 14 11765239 2026-05-11 During World War II, a phenomenon terrorizes American airmen in the night skies over Europe; the pilots call these fireballs foo fighters, and swear they move at over 200 mph and defy the laws of physics; but what are they?; what's the hidden truth behind the foo fighters of World War II? 42 7 14 https://artworks.thetvdb.com/banners/v4/episode/11765239/screencap/69f05d4303396.jpg