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NASA's unexplained files -- The aliens have landed -- Killer aliens

Mysterious flying objects, unexplained disappearances, species invasions: a swirl of suspicion has circled our planet for decades, but few definitive answers have been offered. This collection combs through three and a half hours of evidence, interviews, and theories that attempt to explain the unexplained. From astronauts to abductees, a variety of sources submit film footage and firsthand testimonies to be examined in search for the truth

Originally aired in 2001-2012

Rating: TVPG

DVD, widescreen (1.78:1) presentation

English dialogue; English subtitles