Director: Ian Levison
A look is taken at exclusive NASA footage and firsthand accounts of mysterious fly objects from astronauts and scientists are presented.
S1 E1: Episode 1
In 2005, NASA astronaut Leroy Chiao's spacewalk was interrupted by bright lights flying past. Is there a logical explanation or was there really something strange out there?
S1 E2: Alien Death Ray
The Viking Lander may have found life on Mars, but why don't we know about it? Plus, how could a starship be spotted in the Aurora Borealis?
S1 E3: Black Knight Rises
A chunk of the sun appears to have vanished. Plus, the Hubble Space Telescope spots thousands of unidentified objects travelling faster than light. Are we being watched?
S1 E4: Interstellar Gold Rush
A distant planet shows evidence of an Earth-like atmosphere, while a mysterious glowing light on the Moon mystifies astronauts. Have they found evidence of a crashed alien ship?
S1 E5: Episode 5
Countless mysterious objects have been caught by NASA's cameras. We'll reveal NASA's top ten unexplained encounters using groundbreaking interviews with astronauts and scientists.
S1 E6: Episode 6
When astronaut Leroy Chao's high-risk spacewalk is interrupted by bright lights flying past, it sparks a major investigation. Could alien life forms be to blame?
S2 E1: Life In Hell
A UFO crashes in Pennsylvania. Was it a secret Soviet satellite, or something far more dangerous? On Mercury, NASA finds the impossible: frozen water.
S2 E2: Top Secret Terror
Images of Mercury reveal massive spider-like formations on its surface. Is it an odd geological formation - or something much more ominous?
S2 E3: Lethal Weapons
The show returns with more mysterious encounters, unusual discoveries and strange sightings, straight from NASA's best and brightest.
S2 E4: Hammer Of Thor
What are the mysterious trails on the lunar surface near the Apollo landing sites? Does a strange space object spell disaster for the crew of the space shuttle?
S2 E5: Revenge Of The Fireflies
Something in space is attacking the brains of our astronauts. What is it? Should NASA be worried about the sudden appearance of so-called space fireflies?
S2 E6: Spacewalk Of Doom
An astronaut on a spacewalk begins to drown. How could this alarming event happen? Plus, have NASA discovered an asteroid that's been converted into a spacecraft?
S2 E7: Did We Nuke Jupiter?
Could NASA really be responsible for a nuclear explosion on Jupiter? Could new evidence finally reveal the truth behind the mystery of the iconic face on Mars?
S2 E8: Nazis On The Moon
A Russian probe discovers something has disturbed the lunar soil before the US or the USSR got there. But did the Nazis get there first?
S3 E1: Pluto's Stranger Things
S3 E2: Rise Of The Planet Killer
S3 E3: A President's Close Encounter
S3 E4: The Earth Next Door
S3 E5: Curse Of The Full Moon
Two cosmonauts fight for their lives, trapped inside a capsule in a frozen lake. NASA astronomers are spooked when the full moon affects their experiments.
S3 E6: Did Earth Have Two Moons?
A starling discovery suggests the hellish clouds of Venus may be the origin of life on Earth. Plus, did the earth once have two moons?
S3 E7: Mystery Of The Invisible Planet
S3 E8: Attack Of The Thunderballs
S3 E10: Curse Of The Gas Giant
S3 E11: The Sun's Evil Twin
S3 E12: Secret Aliens
S3 E13: Stonehenge On Mars
S3 E14: Cia's Secret Revenge
S3 E16: Saturn's Death Star
A NASA spacecraft suffers a malfunction in orbit - can its lone astronaut make it back to Earth? Plus, new evidence emerges over Yuri Gagarin's mysterious death.
S4 E1: Pluto's Evil Twin
After NASA's New Horizons spacecraft flies by Pluto, it encounters a mysterious object that shuts down the probe's computers. Experts investigate what it could be.
S4 E2: The Black Hole Next Door
When a black hole looms perilously close to Earth, NASA's finest minds confront the abyss. Secrets of the cosmos unfold, blurring the lines between science and the unknown.
S4 E3: Aliens Vs Stalin At Area 51
Experts investigate whether the Roswell UFO incident was a Soviet conspiracy masterminded by Stalin, or is the story just another cover-up?
S4 E4: Saturn's Moon Monsters
When NASA discovers something strange on Saturn's biggest moon, experts investigate if aliens feeding on the world's electric atmosphere could be the culprit.
S4 E5: Planet Of The Metal Aliens
Experts investigate if a nearby exoplanet could be the home to an alien civilization after a new discovery confirms that life can thrive on such a world.
S4 E6: Did Aliens Nuke Mars?
A strange discovery by NASA's Mars Curiosity rover suggests the Red Planet was home to an alien nuclear war 300 million years ago. Experts investigate if an extraterrestrial Armageddon transformed the Earth-like world into a wasteland.
S4 E7: Aliens In The Amazon
Neil Armstrong led an expedition into the Amazon seeking a library apparently made by aliens. Did a close encounter on his moonwalk inspire his quest?
S4 E8: Secrets Of The Alien Signals
When NASA begins an experiment to communicate with dolphins, experts examine if it's a prelude to making alien contact. Will it have dire consequences?
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