An actor and screenwriter Walter Koenig started his professional acting career in the mid-1960s and quickly rose to prominence for his supporting role as Ensign Pavel Chekov in Star Trek: The Original Series . His script for the Star Trek: The Animated Series episode, "The Infinite Vulcan" made him the first cast member to write a Star Trek story for television. 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 . Una McCormack is best known as the author of numerous tie-in novels based on the TV series Star Trek and Doctor Who . She is the author of The Baba Yaga and The Star of the Sea , part of the Weird Space series. Greg Cox has written numerous Star Trek novels, including The Eugenics Wars , The Q Continuum , Assignment: Eternity , and The Black Shore . His first Khan novel, The Eugenics Wars: Volume One , was voted best sci-fi book of the year by the readers of Dreamwatch magazine. David Mack co-wrote the fourth-season Deep Space Nine episode "Starship Down.

" Another story he pitched was bought three years later as the basis for the seventh-season episode "It's Only a Paper Moon." Keith R. A. DeCandido has written novels for the Star Trek , Alien , Supernatural , and Buffy the Vampire Slayer franchises among others, as well as Farscape comic books. He has also written novels based on Marvel's Spider-Man and wrote the novelization for the film Serenity .