Credits

• 1986 · Horrible Horror as Colonel Karl Osler in 'She Demons'
• 1967 · Garrison's Gorillas as
• 1966 · Spy Smasher Returns as Col. Von Kahr
• 1963 · The Prize as Mr. Rolfe Bergh - Chaperon
• 1963 · Decision at Midnight as
• 1962 · Saints and Sinners as Otto Masuis
• 1962 · The Pigeon That Took Rome as Col. Wilhelm Krafft
• 1961 · On the Double as Oberkommandant
• 1959 · The Rebel as Frank Gottwald
• 1959 · A Private's Affair as Dr. Leyden
• 1959 · One Step Beyond as Josef
• 1959 · One Step Beyond as Dr. Heinrick Swansen
• 1958 · 77 Sunset Strip as
• 1958 · Frankenstein 1970 as Wilhelm Gottfried
• 1958 · She Demons as Col. Karl Osler
• 1957 · The Walter Winchell File as
• 1955 · Alfred Hitchcock Presents as Cafe Host
• 1954 · The Snow Creature as Dr. Louis DuPont
• 1954 · A Star Is Born as Mr. Ettinger (uncredited)
• 1954 · Jungle Gents as Dr. Goebbel
• 1954 · Magnificent Obsession as Dr. Albert Fuss
• 1954 · King Richard and the Crusaders as Austrian Knight (uncredited)
• 1954 · Silver Needle in the Sky as Dr. Loran
• 1953 · Captain Scarface as Dr. Yeager
• 1953 · South Sea Woman as Capt. van Dorck
• 1953 · Phantom from Space as Dr. Wyatt
• 1952 · Adventures of Superman as
• 1952 · Adventures of Superman as Dr. Rudolf Albrecht
• 1952 · Dangerous Assignment as
• 1951 · Target Unknown as Doctor (uncredited)
• 1950 · Space Patrol as
• 1950 · Kill or Be Killed as Gregory Marek
• 1949 · Act of Violence as German (voice) (uncredited)
• 1946 · Dangerous Millions as Rudolph Busch
• 1946 · Under Nevada Skies as Alberti
• 1945 · Escape in the Desert as Hoffman
• 1945 · Counter-Attack as Stillman
• 1942 · Sherlock Holmes and the Secret Weapon as Braun (uncredited)
• 1942 · The Great Impersonation as Karl Hofmann
• 1942 · Junior Army as Horner - Nazi Saboteur (as Robert O. Davis)
• 1942 · The Devil with Hitler as Nazi Officer at Hitler's filmed Speech (uncredited)
• 1942 · Desperate Journey as Kruse
• 1942 · The Secret Code as Rudi Thysson
• 1942 · The Pied Piper as Lieutenant
• 1942 · Riders of the Northland as Agent (as Robert O. Davis)
• 1942 · The Phantom Plainsmen as Colonel Eric Hartwig (as Robert O. Davis)
• 1942 · Eagle Squadron as German Squad Leader
• 1942 · Spy Smasher as Col. Von Kohr
• 1942 · To Be or Not to Be as Gestapo Sergeant at Desk at Top of Hotel Stairs (uncredited)
• 1942 · Nazi Agent as Cab Driver (uncredited)
• 1941 · King of the Texas Rangers as His Excellency
• 1941 · A Dangerous Game as Dr. Fleming
• 1941 · Down in San Diego as Henry Schrode
• 1941 · Underground as Official
• 1941 · Mr. Dynamite as Frederick the Butler
• 1940 · Arise, My Love as Prussian Officer (Uncredited)
• 1940 · Meet the Wildcat as Feral--Henchman
• 1940 · The Great Dictator as Tomanian Commandant at Osterlich / Robert O. Davis
• 1940 · Knute Rockne All American as Elder in Norway (uncredited)
• 1940 · The Man I Married as Storm Trooper
• 1940 · The Mortal Storm as Gestapo Official Hartman
• 1939 · Escape to Paradise as Alexander Komac
• 1939 · The Mad Empress as Herzfeld
• 1939 · Pack Up Your Troubles as Von Richtman
• 1939 · Espionage Agent as Paul Strawn (as Robert O. Davis)
• 1939 · Confessions of a Nazi Spy as Captain Straubel
• 1938 · That Mothers Might Live as Doctor (uncredited)
• 1937 · Champagne Waltz as Emperor Franz Joseph
• 1936 · We're in the Legion Now as Sgt. Groeber
• 1935 · Last of the Pagans as Superintendant's Assistant (uncredited)
• 1935 · Rendezvous as Radio Operator (uncredited)
• 1935 · Here's to Romance as Violinist
• 1934 · Hell in the Heavens as Lt. Schroeder (as Rudolph Amendt)
• 1934 · The Fountain as Geof Van Leyden
• 1934 · Stamboul Quest as Karl (as Rudolph Amendt)