Rudolph Anders

Spy Smasher Returns

Col. Von Kahr

The Prize

Mr. Rolfe Bergh - Chaperon

Decision at Midnight

Uncle

The Pigeon That Took Rome

Col. Wilhelm Krafft

On the Double

Oberkommandant

A Private's Affair

Dr. Leyden

Frankenstein 1970

Wilhelm Gottfried

She Demons

Col. Karl Osler

The Snow Creature

Dr. Louis DuPont

A Star Is Born

Mr. Ettinger (uncredited)

Jungle Gents

Dr. Goebbel

Magnificent Obsession

Dr. Albert Fuss

King Richard and the Crusaders

Austrian Knight (uncredited)

Silver Needle in the Sky

Dr. Loran

Captain Scarface

Dr. Yeager

South Sea Woman

Capt. van Dorck

Phantom from Space

Dr. Wyatt

Target Unknown

Doctor (uncredited)

Kill or Be Killed

Gregory Marek

Act of Violence

German (voice) (uncredited)

Dangerous Millions

Rudolph Busch

Under Nevada Skies

Alberti

Escape in the Desert

Hoffman

Counter-Attack

Stillman

Sherlock Holmes and the Secret Weapon

Braun (uncredited)

The Great Impersonation

Karl Hofmann

Junior Army

Horner - Nazi Saboteur (as Robert O. Davis)

The Devil with Hitler

Nazi Officer at Hitler's filmed Speech (uncredited)

Desperate Journey

Kruse

The Secret Code

Rudi Thysson

The Pied Piper

Lieutenant

Riders of the Northland

Agent (as Robert O. Davis)

The Phantom Plainsmen

Colonel Eric Hartwig (as Robert O. Davis)

Eagle Squadron

German Squad Leader

Spy Smasher

Col. Von Kohr

To Be or Not to Be

Gestapo Sergeant at Desk at Top of Hotel Stairs (uncredited)

Nazi Agent

Cab Driver (uncredited)

King of the Texas Rangers

His Excellency

A Dangerous Game

Dr. Fleming

Down in San Diego

Henry Schrode

Underground

Official

Mr. Dynamite

Frederick the Butler

Arise, My Love

Prussian Officer (uncredited)

Meet the Wildcat

Feral--Henchman

The Great Dictator

Tomanian Commandant at Osterlich / Robert O. Davis

Knute Rockne All American

Elder in Norway (uncredited)

The Man I Married

Storm Trooper

The Mortal Storm

Gestapo Official Hartman

Escape to Paradise

Alexander Komac

The Mad Empress

Herzfeld

Pack Up Your Troubles

Von Richtman

Espionage Agent

Paul Strawn (as Robert O. Davis)

Confessions of a Nazi Spy

Captain Straubel

That Mothers Might Live

Doctor (uncredited)

Champagne Waltz

Emperor Franz Joseph

We're in the Legion Now

Sgt. Groeber

Last of the Pagans

Superintendant's Assistant (uncredited)

Rendezvous

Radio Operator (uncredited)

Here's to Romance

Violinist

Hell in the Heavens

Lt. Schroeder (as Rudolph Amendt)

The Fountain

Geof Van Leyden

Stamboul Quest

Karl (as Rudolph Amendt)