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In 1949 he worked for Gustav Ucicky as associate director.
One year later he contributed to the screen play of Die Sünderin (The Sinner). Eventually in 1951 he was credited as director for the first time. Afterwards he directed three films starring the Austrian star O. W. Fischer who at that time was very popular in German-speaking countries. This included 1955's Hanussen.
Due to his reputation to be an expert concerning Karl May, he got involved in Karl May movies in the 1960s. When he had written the screen play for Das Vermächtnis des Inka ("The heritage of the Inca") he decided to direct and produce it himself. Since the film was less successful than other Karl May movies, he consequently then concentrated on his career as an actor.
Georg Marischka appeared in many films including international productions like the feature films The Odessa File and The Boys from Brazil. He appeared in Das Blaue Palais and had in particular a reoccurring role as Jutes chief "Yorath" in the British TV series Arthur of the Britons.
- The Merry Farmer (1951)
- To Be Without Worries (1953)
- Hanussen (1955)
- Peter Voss, Hero of the Day (1959)
- Das Vermächtnis des Inka (1965)
- Franz Zwetschi Marischka: Immer nur lächeln. Geschichten und Anekdoten von Theater und Film. Wien: Amalthea, 2001; ISBN 978-3-85002-442-6.