Self - Narrator (voice)
Self - Psychedelic User (as Octavian C. Mihai)
Self - Author, How to Change Your Mind
Self - LSD Trial Subject (archive footage)
Self - Director of Research, Spring Grove (archive footage)
Self - Director, National Institute of Mental Health (archive footage)
Self - Professor, Johns Hopkins University
Self - Psychologist (archive footage)
Self - John Hopkins Researcher & Guide
Self - Inventor of LSD (archive footage) (as Albert Hoffman)