"A trading company manager travels up an African river to find a missing outpost head and discovers the depth of evil in humanity's soul."
Roddy McDowall
as Charles Marlow
Eartha Kitt
as The Queen
Oskar Homolka
as The Doctor
Cathleen Nesbitt
as The Crone
Richard Haydn
as The Accountant
Inga Swenson
as Maria
Boris Karloff
as Mr. Kurtz
Willard Sage
as The Chaplain
Fintan Meyler
as The Woman
Rusty Lane
as Griggs
Tom Palmer
as The District Officer
Nora O'Mahoney
as Abbey
Richard Rust
as Ship's Cabin Boy (uncredited)
Lillian Taylor
as Villager (uncredited)
George R. Nelson
Set Decoration
Robert Tyler Lee
Art Direction
Ralph Senensky
Production Supervisor
Robert Drasnin
Original Music Composer
Russell Stoneham
Associate Producer
Joseph Conrad
Novel
Robert Butler
Assistant Director
Ron Winston
Director
Fred Coe
Producer
Leard Davis
Lighting Director
Bo Goldman
Brooks Graham
Technical Supervisor
Stewart Stern
Writer
Ethel Winant
Casting