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The Best Episodes of NASA's Unexplained Files Season 4

Every episode of NASA's Unexplained Files Season 4 ranked from best to worst. Discover the Best Episodes of NASA's Unexplained Files Season 4!

Binge this in 8h 0m·Peaking at 7.3/10
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Episode Rankings

  1. #1 Fan Favorite
    NASA's Unexplained Files Season 4 Episode 8 - Mars's Deepest Secret
    7.3/10(27 votes)

    S4:E8

    British astronomers working for the CIA intercept Soviet photos of the moon. A malfunction on the ISS could poison its crew with ammonia gas. A startling image taken by a NASA probe points to evidence that life could exist on Mars.

    Director:Unknown
    Writer:Unknown

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  2. NASA's Unexplained Files Season 4 Episode 3 - A President's Close Encounter
    7.2/10(28 votes)

    S4:E3

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

    Director:Unknown
    Writer:Unknown

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  3. NASA's Unexplained Files Season 4 Episode 6 - Did Earth Have Two Moons?
    7.2/10(31 votes)

    S4:E6

    A discovery suggests the hellish clouds of Venus may be the origin of life on Earth. A bizarre sighting 2,000 years ago raises the possibility that Earth once had two moons. A scientist helps the FBI crack the 1996 Olympic bombing.

    Director:Unknown
    Writer:Unknown

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  4. NASA's Unexplained Files Season 4 Episode 7 - Mystery of the Invisible Planet
    7.1/10(27 votes)

    S4:E7

    A probe carrying a message to aliens malfunctions as it enters deep space. A NASA mission goes disastrously wrong when an imposter breaches Mission Control. Astronomers may have found an invisible planet around a distant star.

    Director:Unknown
    Writer:Unknown

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  5. NASA's Unexplained Files Season 4 Episode 4 - The Earth Next Door
    7.0/10(28 votes)

    S4:E4

    Astronomers detect a potentially habitable planet tantalizingly close to Earth. A chance discovery at NASA reveals a top secret military space program. The Apollo missions bring back evidence that the moon may be rich in the building blocks for life.

    Director:Unknown
    Writer:Unknown

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  6. NASA's Unexplained Files Season 4 Episode 2 - Rise of the Planet Killer
    6.9/10(30 votes)

    S4:E2

    A probe captures an image of a strange structure on Mars. Files from the first Apollo mission record an eerie sighting on the dark side of the Moon. A planet-eating star gives scientists a glimpse of Earth's terrible demise.

    Director:Unknown
    Writer:Unknown

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  7. NASA's Unexplained Files Season 4 Episode 1 - Pluto's Stranger Things
    6.7/10(28 votes)

    S4:E1

    Astronomers find evidence for incredible alien technology around a distant star. The first pictures of Pluto may show something moving across its surface. Apollo astronauts see something they can't explain as they approach the Moon.

    Director:Unknown
    Writer:Unknown

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  8. NASA's Unexplained Files Season 4 Episode 5 - Curse of the Full Moon
    6.6/10(25 votes)

    S4:E5

    Two cosmonauts fight for their lives while trapped inside a capsule in a frozen lake. A NASA scientist investigates the deadly Nazi secret that doomed the Hindenburg. NASA astronomers are spooked when the full moon starts affecting their experiments.

    Director:Unknown
    Writer:Unknown

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Season 4 Ratings Summary

"Mars's Deepest Secret" is the best rated episode of NASA's Unexplained Files season 4. It scored 7.3/10 from 27 votes. Written and directed by Unknown, it aired on October 18, 2016. This episode is rated 0.1 points higher than the second-best, "A President's Close Encounter".