Paul Altmeyer
Self - Host

John Gittinger
Self

Timothy Leary
Self

Sidney Cohen
Self - LSD Expert

James Moore
Self - Chemist

Lyman Kirkpatrick
Self - Former CIA Inspector General

Robert Gordon Wasson
Self

James Thornwell
Self - Army Private (Ret.)

Maurice Dongier
Self - Allan Memorial Institute

Robert Cleghorn
Self

Fidel Castro
Self (archive footage)

Laurence Harvey
Raymond Shaw (archive footage)

Sidney Gottlieb
Self