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Sinister shapes hover over Chicago and Ruwa, Zimbabwe; an Australian is fighting for his life after taking a blast from a mysterious object; a UFO appears to taunt a U.S. military fighter jet over the Bermuda Triangle.
Was Einstein a witness to a crashed disc? Was the ancient site of Gobekli Tepe built by aliens? Was Erich von Däniken correct about Ancient Astronauts? And was a 1950 German UFO case covered up? These mysteries remain unexplained.
Digging into a UFO crash caught on camera in Brazil; a close encounter of the Beatles kind; finding out if aliens shut down a nuclear missile launch site in Montana; looking at the shapes of UFOs and considering a link between ghosts and aliens.
Accounts of an amphibious UFO in Indonesia; a mass abduction in Australia; a slew of deaths in Wales after a strange sighting; searching for an alien library with an astronaut and meeting a scientist hunting for an interdimensional portal.
Taking a look at strange crafts flying over power plants, airports and the Royal Palace in Sweden, a veteran with supposed UFO-related health issues and footage shown at a US congressional hearing.
Investigating reports of UFOs massed over the South China Sea, ancient carvings of alienlike humanoids, and Albert Einstein's secret 1947 visit to Roswell, New Mexico.
A look at a series of metal cubes seen spinning in the sky over Earth; exploring the origin of an angel-shaped apparition; China's interest in aliens; a metal alloy that may power UFOs; scareships.
A mysterious doorway on Mars; victims of a UFO in the Amazon; an alien party crasher at the Queen's Jubilee in London; animal mutilations in France; a video of otherworldly visitors to Turkey.
Fending off a swarm of aggressive UFOs with a U.S. warship; an alien voice takes over a British TV broadcast; an Australian teacher who was threatened after a UFO sighting at school; exploring who the Men in Black really are.
A new kind of alien; picking apart an abduction case in the UK; learning why NASA is investigating UFOs after decades of denial; looking at time travel.