Mark Bazeley
Self - Narrator (voice) (10 eps)
Guy Walters
Self - Historian (10 eps)
Tony McMahon
Self - Historian (10 eps)
Luis Elizondo
Self - Former US Intelligence Official (10 eps)
Karen Bellinger
Self - Anthropologist Archaeologist (10 eps)
Thomas Gadinger
Self - Science Journalist (10 eps)
Linda Rodriguez-McRobbie
Self - Journalist (10 eps)
