A startling new report claims a prominent astrophysicist worked on an aircraft reverse-engineered from the parts of downed UFOs. Ben Hansen investigates.

Evidence of a possible extraterrestrial breeding program sends Ben Hansen to the Bay Area, San Francisco, California, in search of answers about alien-human hybrids. He suspects there may be a link to the Betty and Barney Hill case, one of the world's most famous abduction stories.