Niall MacGinnis as Martin Luther

John Ruddock as Vicar von Staupitz

Pierre Lefevre as Spalatin

Guy Verney as Melanchthon

Alastair Hunter as Carlstadt

David Horne as Duke Frederick

Fred Johnson as Prior

Philip Leaver as Pope Leo X

Heinz Piper as Dr. Eck

Leonard White as Emissary

Egon Strohm as Cardinal Alexander

Annette Carell as Katherine von Bora (as Annette Carrell)

Alexander Gauge as Tetzel

Henry Oscar as

Irving Pichel as Brueck