The Unknown Terror: Reparto
John Howard
Dan Matthews
Mala Powers
Gina Matthews
Paul Richards
Peter Morgan
May Wynn
Concha Ramsey
Gerald Milton
Dr. Ramsey
Duane Grey
Lino
Richard Gilden
Raoul Koom
Martín Garralaga
Lead Villager
Patrick O'Moore
Dr. Willoughby
William Hamel
Mr. Trainor
Charles Grey
Jim Wheatley / ?The Monster Man
Charles Postal
Higgs (butler)
Sir Lancelot
Sir Lancelot
Charles Cirillo
Native (uncredited)
Jim Whitecloud
Native (uncredited)
Foster Hood
Native (uncredited)