The Alien Threat Behind the Battle of LA | History's Greatest Mysteries (S5)

On February 24, 1942, less than three months after the Japanese bombed Pearl Harbor, military radar picks up what appears to be enemy aircraft over Los Angeles. See more in this clip from Season 5, Episode 7, "The Battle of Los Angeles."

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The Alien Threat Behind the Battle of LA | History's Greatest Mysteries (S5)
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