The War of the Worlds
The Martians all die following exposure to Earth's "benign" airborne bacteria.
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Read more about this film at The Internet Movie Database.
Read the original H.G. Wells novel on-line: Site 1 Site 2
Listen to the Halloween 1938 Orson Welles radio adaptation (Shoutcast-compatible streaming media player required).
Buy it on VHS or DVD at Amazon.com.