斯蒂文·格瑞尔

Steven M. Greer

饰：自己

罗伯特·克洛特沃西

Robert Clotworthy

饰：Self - Narrator

Jim Marrs

饰：Self - Author, Alien Agenda

Bradley T. Lepper

饰：(as Brad Lepper)

乔治欧·A·索卡洛斯

Giorgio A. Tsoukalos

饰：Self - Publisher, Legendary Times Magazine

Michael Dennin

饰：(as Michael Dennin PhD)

艾利希·冯·丹尼肯

Erich von Däniken

饰：Self - Author, Chariots of the Gods

安布罗斯·比尔斯

Ambrose Bierce

饰：(archive footage)

拉尔夫·瓦尔多·爱默生

Ralph Waldo Emerson

饰：(archive footage)

沃尔特·惠特曼

Walt Whitman

饰：(archive footage)

Philip Coppens

饰：Self - Author Investigative Journalist

Marshall Trimble

饰：Self - Author, A Roadside History of Arizona

David Childress

饰：Self - Author, Technology of the Gods

Tok Thompson

饰：(as Tok Thompson PhD)

Standing Elk

饰：Self - Chief, Yankton Dakota Tribe

Jonathan Young

饰：(as Jonathan Young PhD)