Examining alleged encounters with alien spacecrafts.
Examining a theory that early humans communicated with extraterrestrials from mountain peaks.
Exploring the "Greys," alleged alien beings with gray skin, enlarged heads and large eyes. Included: how the beings have been depicted in carved rock art through the ages.
A look at the search for other planets capable of sustaining life.
Exploring a theory that spiritual leaders have communicated with extraterrestrials throughout history.
Theorists ponder recent evidence of past extraterrestrial intervention on Earth.
Scientists explore a theory that alien sightings may be evidence of time travelers from the future.
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