In science fiction, aliens are usually either incredibly benevolent or incomprehensibly evil -- but how would real extraterrestrials behave? Learn more about aliens -- and why Stephen Hawking thinks they may destroy us -- in this podcast.
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From the Vault: The Salt Vampires of Star Trek
1:05:47

Weirdhouse Cinema: Warriors of the Year 2072
1:44:28

Mercury: Inner Messenger, Part 4
59:28