Credits

• 1967 ·Garrison's Gorillasas
• 1966 ·Spy Smasher Returnsas Col. Von Kahr
• 1963 ·The Prizeas Mr. Rolfe Bergh - Chaperon
• 1963 ·Decision at Midnightas
• 1962 ·Saints and Sinnersas Otto Masuis
• 1962 ·The Pigeon That Took Romeas Col. Wilhelm Krafft
• 1961 ·On the Doubleas Oberkommandant
• 1959 ·The Rebelas Frank Gottwald
• 1959 ·A Private's Affairas Dr. Leyden
• 1959 ·One Step Beyondas Josef
• 1959 ·One Step Beyondas Dr. Heinrick Swansen
• 1958 ·77 Sunset Stripas
• 1958 ·Frankenstein 1970as Wilhelm Gottfried
• 1958 ·She Demonsas Col. Karl Osler
• 1957 ·The Walter Winchell Fileas
• 1955 ·Alfred Hitchcock Presentsas Cafe Host
• 1954 ·The Snow Creatureas Dr. Louis DuPont
• 1954 ·A Star Is Bornas Mr. Ettinger (uncredited)
• 1954 ·Jungle Gentsas Dr. Goebbel
• 1954 ·Magnificent Obsessionas Dr. Albert Fuss
• 1954 ·King Richard and the Crusadersas Austrian Knight (uncredited)
• 1954 ·Silver Needle in the Skyas Dr. Loran
• 1953 ·Captain Scarfaceas Dr. Yeager
• 1953 ·South Sea Womanas Capt. van Dorck
• 1953 ·Phantom from Spaceas Dr. Wyatt
• 1952 ·Adventures of Supermanas
• 1952 ·Adventures of Supermanas Dr. Rudolf Albrecht
• 1952 ·Dangerous Assignmentas
• 1951 ·Target Unknownas Doctor (uncredited)
• 1950 ·Space Patrolas
• 1950 ·Kill or Be Killedas Gregory Marek
• 1949 ·Act of Violenceas German (voice) (uncredited)
• 1946 ·Dangerous Millionsas Rudolph Busch
• 1946 ·Under Nevada Skiesas Alberti
• 1945 ·Escape in the Desertas Hoffman
• 1945 ·Counter-Attackas Stillman
• 1942 ·Sherlock Holmes and the Secret Weaponas Braun (uncredited)
• 1942 ·The Great Impersonationas Karl Hofmann
• 1942 ·Junior Armyas Horner - Nazi Saboteur (as Robert O. Davis)
• 1942 ·The Devil with Hitleras Nazi Officer at Hitler's filmed Speech (uncredited)
• 1942 ·Desperate Journeyas Kruse
• 1942 ·The Secret Codeas Rudi Thysson
• 1942 ·The Pied Piperas Lieutenant
• 1942 ·Riders of the Northlandas Agent (as Robert O. Davis)
• 1942 ·Eagle Squadronas German Squad Leader
• 1942 ·The Phantom Plainsmenas Colonel Eric Hartwig (as Robert O. Davis)
• 1942 ·Spy Smasheras Col. Von Kohr
• 1942 ·To Be or Not to Beas Gestapo Sergeant at Desk at Top of Hotel Stairs (uncredited)
• 1942 ·Nazi Agentas Cab Driver (uncredited)
• 1941 ·King of the Texas Rangersas His Excellency
• 1941 ·A Dangerous Gameas Dr. Fleming
• 1941 ·Down in San Diegoas Henry Schrode
• 1941 ·Undergroundas Official
• 1941 ·Mr. Dynamiteas Frederick the Butler
• 1940 ·Arise, My Loveas Prussian Officer (Uncredited)
• 1940 ·Meet the Wildcatas Feral--Henchman
• 1940 ·The Great Dictatoras Tomanian Commandant at Osterlich / Robert O. Davis
• 1940 ·Knute Rockne All Americanas Elder in Norway (uncredited)
• 1940 ·The Man I Marriedas Storm Trooper
• 1940 ·The Mortal Stormas Gestapo Official Hartman
• 1939 ·Escape to Paradiseas Alexander Komac
• 1939 ·The Mad Empressas Herzfeld
• 1939 ·Pack Up Your Troublesas Von Richtman
• 1939 ·Espionage Agentas Paul Strawn (as Robert O. Davis)
• 1939 ·Confessions of a Nazi Spyas Captain Straubel
• 1938 ·That Mothers Might Liveas Doctor (uncredited)
• 1937 ·Champagne Waltzas Emperor Franz Joseph
• 1936 ·We're in the Legion Nowas Sgt. Groeber
• 1935 ·Last of the Pagansas Superintendant's Assistant (uncredited)
• 1935 ·Rendezvousas Radio Operator (uncredited)
• 1935 ·Here's to Romanceas Violinist
• 1934 ·Hell in the Heavensas Lt. Schroeder (as Rudolph Amendt)
• 1934 ·The Fountainas Geof Van Leyden
• 1934 ·Stamboul Questas Karl (as Rudolph Amendt)