Life in Hell

A UFO crashes in Pennsylvania. Was it a secret Soviet satellite or something far more dangerous? On Mercury, NASA finds frozen water. A strange object causes a skyscraper-sized shadow on the surface of Mars's largest moon.

Top Secret Terror

Was the moon landing faked? Images of Mercury reveal massive spider-like formations on its surface. Is it an odd geological formation or something much more ominous? A classified space shuttle mission ends in near disaster.

Hammer of Thor

Are burning lights in the sky signs of a secret space weapons project? What are the mysterious trails on the lunar surface near the Apollo landing sites? Does a strange object spell disaster for the crew of the space shuttle?

Spacewalk of Doom

How could an astronaut on a spacewalk begin to drown? Have NASA scientists discovered an asteroid that's been converted into a spacecraft? What are the strange objects spotted when NASA sends a top-secret payload into space?

Did We Nuke Jupiter?

Could NASA be responsible for a nuclear explosion on Jupiter? Could new evidence finally reveal the mystery of the iconic face on Mars? What unknown force crashed a spacecraft from the Apollo program into the lunar surface?

Nazis on the Moon

A Russian probe discovers something has disturbed the lunar soil before the US or the USSR got there. Did Nazis get there first? Have scientists detected a laser signal from a planet capable of supporting life?

Lethal Weapons

How did pictures from the Hubble telescope make the comet of the century look like an alien spacecraft? Has earth already been invaded by alien organisms? What mysterious force is smashing a near-earth asteroid to pieces?

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? Who could be responsible for the glowing spiral in the skies over Norway?

Pluto Under Pressure

Lost tapes reveal that Apollo astronauts heard unexplained transmissions on the far side of the moon, an amateur astronomer spots a strange disturbance and an unidentified object in Earth orbit stalks Russian spacecraft.

Return of the Moon Bugs

Apollo 12 astronauts bring back something alive from the moon and NASA tracks an asteroid heading towards Earth but make a shocking discovery: it's not an asteroid, but an object that's artificial in nature.

Rise of the Ice Creatures

Neil Armstrong goes into an unexplained spin. He needs to figure out what's causing it, or he faces certain death. An Apollo 17 photo seems to show a US military outpost on the moon.

Ghosts on a Comet

When a Chinese moon rover breaks down, a NASA scientist points to a mysterious material that seemed to sabotage the Apollo missions decades earlier. The Rosetta spacecraft finds a comet that appears to be singing.

The Moon that Disappeared

Recently discovered documents reveal NASA's secret plan B for failure of the first moon landing, and a Soyuz capsule carrying NASA astronaut Peggy Whitson back to Earth vanishes without explanation.

Curse of the Red Planet

Three cosmonauts die mysteriously as they re-enter Earth's atmosphere, a declassified document reveals a CIA plan to use a space disaster as a cover to start World War III and a NASA rover discovers clues that help solve a murder.

Red Storm Rising

Two astronauts trapped in the vacuum of space face an agonizing death, the first close-up images of Pluto reveal an alien landscape and residents of Houston struggle to explain videos of unidentified flying lights.

Attack of the Thunderballs

Astronauts are evacuated when a mystery object is discovered hurtling towards the ISS, a NASA secret agent goes undercover to recover missing moon rocks and scientists struggle to explain a void at the edge of the solar system.

Pluto's Stranger Things

Astronomers find evidence for alien technology around a distant star. Then, pictures of Pluto show that something might be moving across its surface, and Apollo astronauts see something inexplicable as they approach the moon.

Rise of the Planet Killer

A mission to Mars captures an image of a strange structure. Then, the first Apollo mission records an eerie sighting on the dark side of the moon, and a planet-eating star gives scientists a glimpse of Earth's terrible demise.

A President's Close Encounter

Geysers are discovered on a frozen moon, and NASA redirects a probe on a mission to detect evidence of life. Then, an unidentified object is spotted approaching a near-earth asteroid, and a future president witnesses a UFO.

The Earth Next Door

Astronomers detect a potentially habitable planet close to Earth. Then, a discovery at NASA reveals a top-secret military space program, and missions bring back evidence that the moon could have the building blocks for life.

Curse of the Full Moon

A near collision in space forces two cosmonauts to abort their mission. But a disastrous re-entry leaves them dying in a frozen lake.

Did Earth Have Two Moons?

Scientists investigate an ancient sighting by Roman soldiers which points to the earth having two moons.

Mystery of the Invisible Planet

Astronomers studying a distant solar system discover something extraordinary: evidence of an invisible planet orbiting a star.

Mars's Deepest Secret

The Mars Reconnaissance Orbiter captures an image of bizarre streaks on the Martian surface.

JFK UFO Conspiracy

A recently declassified letter written by President Kennedy demands that the CIA share their UFO data with NASA.

Curse of the Gas Giant

Jupiter is far hotter than it should be, and scientists don't understand why. The Curiosity Rover finds something strange on Mars that could it be a lost spacecraft or something far more sinister. Detectives turn to NASA for help with a murder cold case.

The Sun's Evil Twin

Two suns photographed in the sky over Indonesia may be the first sighting of our sun's evil twin. Then, NASA scientists are baffled by ghostly swirls on the moon's surface, and an astronaut disappears during his return to Earth.

Secret Aliens

An astronomer records an unusual radio signal from beyond our solar system. Then, when scientists discover strange DNA in the octopus, they examine if their origins could be alien.

Stonehenge on Mars

When NASA spots something on Mars that resembles Stonehenge, they investigate what could have made this structure. Then, scientists discover a mysterious hole in Saturn's rings, and an ancient tribe claims contact with aliens.

CIA's Secret Revenge

The CIA hatches a secret revenge plot when the Soviet Union unveils its own space shuttle. Then, recent discoveries shed new light on Sodom and Gomorrah, and a missing nuclear weapon could threaten an Arctic NASA base.

The Moon's Strange Secret

The last humans to walk on the Moon discover something strange on the lunar surface. Then, a scientist investigates a phenomenon responsible for horrific mass deaths, and a NASA mission threatens an American hero's reputation.

Saturn's Death Star

A mysterious object orbiting Saturn looks just like the Death Star. Then, new evidence might shed light on the mysterious death of the first man in space, and a missing cutting-edge satellite escalates fears of a space war.

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. There could be a grisly apocalypse if these monsters make it to Earth.

Aliens vs. Stalin at Area 51

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 or if the confession is just another cover-up.

The Black Hole Next Door

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.

Pluto's Evil Twin

After NASA's New Horizons spacecraft flies by Pluto, it encounters a strange alien object that shuts down the probe's computers. Experts investigate if this mysterious object is an alien spacecraft.

Secrets of the Alien Signals

When NASA begins a strange experiment to communicate with dolphins, experts investigate if it's a prelude to making alien contact, but some fear that such a discovery could have apocalyptic consequences.

Planet of the Metal Aliens

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 world.

Did Aliens Nuke Mars?

A strange discovery by the Mars Curiosity rover suggests the Red Planet was home to an alien nuclear war, and experts investigate if an extraterrestrial Armageddon transformed an earth-like world into the wasteland we know today.

Aliens in the Amazon

Neil Armstrong led 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 mysterious quest.