Ralph Abraham
Self - Mathematician
Steven Barker
Self - Pharmacologist
Cynthia Geist
Self - DMT Study Nurse
Susan Blumenthal
Self - DMT Volunteer
Patricio Dominguez
Self - DMT Volunteer
Neal Goldsmith
Self - Psychologist
Roland Griffiths
Self - Behavioral Pharmocologist
Charles Grob
Self - Psychiatrist
Kathleen Harrison
Self - Ethnobotanist
Terence McKenna
Self - Writer & Cultural Commentator (archive footage)
Graham Hancock
Self - Writer
Dennis J. McKenna
Self - Ethnopharmacologist
Ralph Metzner
Self - Psychologist
Christian Meuli
Self - DMT Volunteer, Family Physician
Jeremy Narby
Self - Anthropologist
Andrew Newberg
Self - Radiologist
David Nichols
Self - Medicinal Chemist
Daniel Pinchbeck
Self - Writer
Douglas Rushkoff
Self - Writer
Spiros Antonopoulos
Self - DMT Volunteer, Yoga Student
Leanna Standish
Self - Naturopathic Physician
Andrew Stone
Self - DMT Volunteer, Software Developer
Rick Strassman
Self - Psychiatrist
Robert Weisz
Self - DMT Volunteer, Clinical Psychiatrist
Ede Frecska
Self - Psychopharmacologist
