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