Leon Askin made his screen debut in the 1952 Robert Parrish-directed American Cold War film noir ‘Assignment – Paris!’ where he made an uncredited appearance as ‘Franz.’ That same year, he also portrayed ‘King Ramayana’ in another American comedy film ‘Road to Bali,’ directed by Hal Walker.
He then went on to star in films like ‘Desert Legion’ (1953), ‘South Sea Woman’ (1953), ‘The Robe’ (1953), ‘Knock on Wood’ (1954), ‘Secret of the Incas’ (1954), ‘Carolina Cannonball’ (1955), ‘Son of Sinbad’ (1955), ‘Spy Chasers’ (1955), ‘Der Schinderhannes’ (1958), ‘The Last Blitzkrieg’ (1959), ‘Abschied von den Wolken’ (1959), ‘Mistress of the World’ (1960), ‘Pension Schöller’ (1960), ‘Blind Justice’ (1961), ‘One, Two, Three’ (1961), and ‘Lulu’ (1962).
In 1962, he played the role of ‘Charles’ in the mystery film ‘Sherlock Holmes and the Deadly Necklace,’ directed by Terence Fisher. The film received more of a mixed response from critics. He next starred as ‘Samir’ in the 1965 J. Lee Thompson-directed American comedy film ‘John Goldfarb, Please Come Home!’ The film failed to perform at the box office. That same year, he also made an appearance in the romantic comedy film ‘Do Not Disturb’ which also turned out to be a commercial failure.
Askin was next seen in films such as ‘What Did You Do in the War, Daddy?’ (1966), ‘Double Trouble’ (1967), ‘The Caper of the Golden Bulls’ (1967), ‘The Wicked Dreams of Paula Schultz’ (1968), ‘Guns for San Sebastian’ (1968), ‘The Maltese Bippy’ (1969), ‘Hammersmith Is Out’ (1972), ‘Doctor Death: Seeker of Souls’ (1973), ‘The World's Greatest Athlete’ (1973), ‘Karl May’ (1974), and ‘Going Ape!’ (1981). He portrayed ‘Moscow Anchorman’ in the 1982 American parody film ‘Airplane II: The Sequel’ directed by Ken Finkleman. The film received a lukewarm response from critics with Roger Ebert remarking that it "never really seems to know whether it's about a spaceship. It's all sight gags, one-liners, puns, funny signs and scatological cross-references." He continued to star in films and television shows like ‘Frightmare’ (1983), ‘Kottan ermittelt’ (1983), ‘A Stroke of Genius’ (1984), ‘Diff'rent Strokes’ (1985), ‘First Strike’ (1985), ‘Odd Jobs’ (1986), ‘Deshima’ (1987), ‘OcchioPinocchio’ (1994), ‘Höhenangst’ (1994), ‘Tödliche Liebe’ (1995), ‘Black Flamingos – Sie lieben euch zu Tode’ (1998), and ‘Kubanisch rauchen’ (1999). He was last seen in the 2001 comedy film ‘Ene mene muh - und tot bist du’ directed by Houchang Allahyari.