Niall MacGinnis

Martin Luther

John Ruddock

Vicar von Staupitz

Pierre Lefevre

Spalatin

Guy Verney

Melanchthon

Alastair Hunter

Carlstadt

David Horne

Duke Frederick

Fred Johnson

Prior

Philip Leaver

Pope Leo X

Heinz Piper

Dr. Eck

Leonard White

Emissary

Egon Strohm

Cardinal Alexander

Annette Carell

Katherine von Bora (as Annette Carrell)

Alexander Gauge

Tetzel

Henry Oscar

Irving Pichel

Brueck

Irving Pichel

Director

Lothar Wolff

Producer

Joseph C. Brun

Cinematography

Fritz Stapenhorst

Editor

Mark Lothar

Music

Allan Sloane

Writer

Lothar Wolff

Writer

Robert E. A. Lee

Executive Producer