故事起源于一件UFO掩盖事件。航天飞机与不明物体相撞后，三名航天员中的一人被害，其余二人是唯一目击者。返回地球后，二人开始调查政府企图掩盖的真相，关于外星人与UFO事件……
Darren McGavin
Harry Forbes
Gary Collins
Steve Bancroft
Robert Vaughn
Gordon Cain
James Hampton
Lew Price
Philip Abbott
Frank Morrison
Joseph Campanella
Frank Lafferty
Pamela Bellwood
Sarah Michaels
Tom Hallick
Phil Cameron
Steven Keats
Paul Bannister
William Schallert
Professor Mills
Cliff Osmond
Sheriff Barlow
Andrew Bloch
Neal Kelso
Stuart Pankin
Sam Tate
Betty Ann Carr
Flo Mattson
