Walter Marvin Koenig 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. He has also acted in several other series and films including Goodbye, Raggedy Ann (1971), The Questor Tapes (1974), Babylon 5 (1993), and Crusade (1999). In addition to his acting career, Koenig has made a career in writing as well and is known for working on Star Trek: The Animated Series (1973), Land of the Lost (1974), Family (1976), What Really Happened to the Class of `65? (1977) and The Powers of Matthew Star (1982). He received Saturn Award nominations for Best Supporting Actor in a Film for both Star Trek II: The Wrath of Khan and Star Trek IV: The Voyage Home.