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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; the disturbing evidence points to an apocalypse if these monsters ever make it to Earth.
When a former Area 51 insider alleges that the Roswell UFO incident was a nefarious Soviet conspiracy masterminded by Stalin, experts investigate if it was indeed an enemy plot against America -- or if the confession is just another cover-up.
When astronomers discover a rogue black hole speeding through the Milky Way, they investigate how much danger this cosmic monster poses to Earth, and what would happen if it ever entered our solar system.
After NASA's New Horizons spacecraft flies by Pluto, it encounters a strange alien world that shuts down the probe's computers; experts investigate if the mysterious object is an alien spacecraft hiding at the edge of the solar system.
After Neil Armstrong's moonwalk, he leads an expedition into the Amazon to find a legendary library that holds all knowledge of an advanced alien civilization; experts ask if a close encounter on the moon's surface inspired Armstrong's quest.
When NASA begins a strange experiment to communicate with dolphins, experts investigate if it's a prelude to making alien contact; some fear that such a discovery could have apocalyptic consequences.
Experts investigate if a nearby exoplanet could be the home to an alien civilization of strange, metallic monsters, after a new discovery confirms that life can thrive on such a strange world.
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 an Earth-like world into a wasteland.
An astronomer records an unusual radio signal from beyond the solar system; FBI agents find classified documents at the home of a NASA scientist; when scientists discover strange DNA in the octopus, they examine if their origins could be alien.
A NASA probe captures an image of a familiar structure on Mars' surface.
The discovery of geysers on a moon; NASA's mission to detect life; an object is spotted approaching an asteroid.
Soviet photos of the moon are intercepted by the CIA; a malfunction aboard the ISS, which imperils the whole crew; NASA probe finds evidence of the possibility of life on Mars.
Lost tapes show that Apollo astronauts heard unexplained transmissions on the far side of the moon; an amateur astronomer finds an odd disturbance in Martian atmosphere; an unidentified object in Earth orbit starts stalking Russian spacecraft.
Apollo 12 astronauts bring back something alive from the moon; NASA tracks an asteroid heading towards Earth but make an incredible discovery.
Neil Armstrong enters an unexplained spin; an Apollo 17 photo seems to show a US military outpost on the Moon; possible alien life swimming in the oceans of Jupiter's moons.
When a Chinese moon rover breaks down, a scientist at NASA points to a mysterious material that seemed to sabotage the Apollo missions decades earlier; the Rosetta spacecraft discovers a comet that appears to be singing.
Recently discovered documents show NASA's secret plan B for failure of the first moon landing; a Soyuz capsule carrying NASA astronaut Peggy Whitson back to Earth goes missing; NASA's Cassini mission unravels a three hundred year old.
Three cosmonauts mysteriously die as they re-enter Earth's atmosphere and NASA needs to know why; a declassified document shows a CIA plan to use a space disaster as a cover to start World War 3.
Two astronauts trapped in the vacuum of space face a horrible death; the first close up images of Pluto show an alien landscape; residents of Houston struggle to explain videos of unidentified flying lights captured above their city at night.
Astronauts evacuate when a mystery object hurtles toward the ISS; a NASA secret agent goes undercover to retrieve missing moon rocks; scientists struggle to find answers when they discover a huge void at the edge of the solar system.
An attempt to explain some of the odd shapes and lights that have been captured on NASA's cameras.
A piece of the sun seems to have vanished; the Hubble spots an unidentified object traveling faster than light.
A distant planet shows an Earth-like atmosphere; a glowing light suggests an atmosphere on the Moon; why there are blueberries on Mars.
Spaceships powered by atomic bombs; artificial rings encircle an entire star; Neil Armstrong's transmission feed cuts off when he spots strange lights on the moon; how can lightning talk to itself.
Answers to questions about the power of atomic bombs, artificial rings, Neil Armstrong's transmission on the moon and lightning.