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Though claims of extraterrestrial encounters have long been dismissed, many believe the existence of UFOs is not just likely, but a certainty.
These documentaries explore conspiracy theories and cover-ups of disasters by powerful (and often nefarious) forces.
After they got tired of anal probing night-fishermen, the extraterrestrials in this list decided to invade earth; a trickier proposition, but probably less depressing on the day in day out.
If ancient aliens and UFOs seem like crackpot theories to you, just remember that astronomers estimate there are 100 billion (with a "b") Earth-like habitable planets in the Milky Way.