Director

Harold Brown

Self - Nutritional Biochemist

Self - Surgeon

Self - Primatologist

Prof. Dr. T. Colin Campbell

Dr. Will Tuttle

Narrator

Voice-Over

Self

Self (former dairy farmer)

Self

Self - Former Cattle and Dairy Farmer

Self (physician and nutrition expert)

Self - Animal Behaviorist

Self - Physician and Psychotherapist

Self - Former Veterinary Director

Self (agricultural expert for Greenpeace)

Self

Writer