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Walter Marvin Koenig (; born September 14, 1936) is an American actor and screenwriter. He began acting professionally in the mid-1960s and quickly rose to prominence for his supporting role as Ensign Pavel Chekov in Star Trek: The Original Series (1967–1969). He went on to reprise this role in all six original-cast Star Trek films, and later voiced President Anton Chekov in Star Trek: Picard (2023). He has also acted in several other series and films including Goodbye, Raggedy Ann (1971), The Questor Tapes (1974), and Babylon 5 (1993). In addition to his acting career, Koenig has made a career in writing as well and is known for working on Land of the Lost (1974), Family (1976), What Really Happened to the Class of '65? (1977) and The Powers of Matthew Star (1982).