16 Episodes

Season 4

Episodes

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  • 16 episodes
    16 episodes
    • s4e20First Contact
    • s4e19Artificial Alien Intelligence
    • s4e18Alien Communications
    • s4e17Mars: The Final Frontier
    • s4e16Mass Sightings
    • s4e15Space Shuttle Encounters
    • s4e13Summer of Saucers
    • s4e12Alien Abduction
    • s4e11Enemy Airspace
    • s4e10Finding Aliens
    • s4e9Alien Journeys
    • s4e7Inside UFOs
    • s4e6Seeing Is Believing
    • s4e5The Shoot Down Order
    • s4e2The 1952 Wave
    • s4e1Second Skin