内尔·德贞

Neil Dudgeon

饰：Narrator,

Vince Pace

饰：Self,(as Vincent Pace)

凯瑞·莎勒

Kerry Shale

饰：Narrator,

Bhagavan Antle

饰：Self

Janet Burger

饰：Self

Gordon Gallup

饰：Self - Psychologist,(as Prof Gordon Gallup)

Stuart Newman

饰：Self - Cell Biologist,(as Prof Stuart Newman)

Wallace Swett

饰：Self - Sanctuary Owner

Frank Burger

饰：Self,(archive footage)

Patrick Dixon

饰：Self,(as Dr Patrick Dixon)

Robert Lanza

饰：Self,(as Dr Robert Lanza)