NASA's Unexplained Files

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.

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.

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.

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.

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.

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.

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.

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.