The BEST episodes of NASA's Unexplained Files season 5

Every episode of NASA's Unexplained Files season 5, ranked from best to worst by thousands of votes from fans of the show. The best episodes of NASA's Unexplained Files season 5!

Strange flying objects have been caught on NASA's cameras and astronauts have reported seeing UFOs. Some of the odd shapes and lights can be identified; others remain a mystery. We'll reveal NASA footage and interview the astronauts and scientists.

Last Updated: 12/8/2024Network: Science ChannelStatus: Ended
Stonehenge on Mars
star
8.24
49 votes

#1 - Stonehenge on Mars

Season 5 - Episode 5 - Aired 5/10/2017

When NASA spots a something on Mars that resembles Stonehenge, they investigate what could have made this strange structure. Scientists discover a mysterious hole in Saturn's rings. An ancient tribe claims contact with alien visitors.

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Secret Aliens
star
8.11
53 votes

#2 - Secret Aliens

Season 5 - Episode 4 - Aired 5/3/2017

An astronomer records an unusual radio signal from beyond our 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.

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The Moon's Strange Secret
star
7.60
15 votes

#3 - The Moon's Strange Secret

Season 5 - Episode 7 - Aired 2/3/2018

The last humans to walk on the Moon discover something strange on the surface. A NASA scientist investigates a strange phenomenon responsible for horrific mass deaths. A landmark NASA mission threatens to destroy the reputation of an American hero.

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JFK UFO Conspiracy
star
7.56
52 votes

#4 - JFK UFO Conspiracy

Season 5 - Episode 1 - Aired 4/12/2017

A declassified letter written by President Kennedy demands the CIA share its UFO data with NASA. A bizarre pattern on the surface of Mars could be a coded alien message. Investigators are shocked to find a rocket crash-landed in a crater on the Moon.

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CIA's Secret Revenge
star
7.55
22 votes

#5 - CIA's Secret Revenge

Season 5 - Episode 6 - Aired 1/27/2018

When the Soviet Union unveils its own space shuttle, the CIA hatches a secret revenge plot. Recent discoveries shed new light on the destruction of Sodom and Gomorrah. A missing nuclear weapon could threaten a NASA base in the Arctic.

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The Sun's Evil Twin
star
7.48
25 votes

#6 - The Sun's Evil Twin

Season 5 - Episode 3 - Aired 4/26/2017

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.

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Curse of the Gas Giant
star
7.43
72 votes

#7 - Curse of the Gas Giant

Season 5 - Episode 2 - Aired 4/19/2017

Scientists wonder why Jupiter is hotter than it should be; the Curiosity Rover finds something strange on Mars; detectives turn to NASA for help with a murder cold case.

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Saturn's Death Star
star
7.36
22 votes

#8 - Saturn's Death Star

Season 5 - Episode 8 - Aired 2/10/2018

A mysterious object is orbiting Saturn, and it looks just like the Death Star. New evidence might shed new light on the mysterious death of Yuri Gagarin, the first man in space. When a cuting-edge satellite vanishes, fears of a space war escalate.

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