After two years' study at the Royal Academy of Dramatic Art, British actor Robert Douglas ascended to leading-man status on the London stage. Among his earliest film appearances was a co-starring stint with Laurence Olivier and Merle Oberon in the Technicolor Alexander Korda production Over the Moon (1936). He spent six years as a pilot in the British Navy, then began his Hollywood career, playing dark-purposed, humorless villains opposite such swashbuckling leading men as Errol Flynn in 1949's The Adventures of Don Juan, Burt Lancaster in 1950's Flame and the Arrow, and Stewart Granger in 1952's The Prisoner of Zenda. He was starred as Benedict Arnold in The Scarlet Coat (1954) and as Agamemnon in Helen of Troy (1955). Rechanneling his energies into directing, Robert Douglas helmed several British and American TV productions, including 18 episodes of the 1960s series 12 O'Clock High. Robert Douglas' only big-screen directorial credit was 1964's Night Train, which starred Sean Flynn, the son of Douglas' Don Juan duelling opponent Errol Flynn.