campaign and eventually are able to rid the solar system of its parasites. Exciting, even if it exacts a strong stomach. Adaptations The Brain Eaters, a 1958 science fiction film directed by Bruno VeSota, bore a number of similarities to Heinlein's novel. Heinlein sued the film's producers, including Executive Producer Roger Corman, for plagiarism, asking $150,000 in damages. The case was settled out of court for $5,000, which included Heinlein's stipulation that his name not be used on screen or in any way with the production. The case halted actor John Payne's intention of producing a film based on Heinlein's novel. The theme of the novel is echoed in "The Invisibles", an episode of The Outer Limits aired in 1964, and also in "Operation -- Annihilate!", the last episode of the first season of Star Trek in 1967. Similarly, in the story line begun in the Star Trek: The Next Generation episode "Coming of Age" and completed in "Conspiracy", aliens from a faraway sector invade the bodies of high-ranking Starfleet admirals in an attempt to compromise the command structure and spearhead an invasion of Earth. The novel was adapted, with some plot and character changes, into the 1994 film of the same name. Influence The Body Snatchers by Jack Finney (1954) takes up a similar premise of extraterrestrials taking over the bodies of humans. Also in the plot of the 1956 What Mad Universe by Fredric Brown—as in that of Puppet Masters—police and vigilantes ruthlessly shoot down anyone suspected of being controlled by the book's invaders from space. Kenneth Von Gunden's novel Star Spawn takes up the basic premise of The Puppet Masters and transfers it to a Medieval setting. Extraterrestrial parasites able to take over the bodies of humans and control them invade Medieval England and embark on conquering it, castle by castle—and are eventually foiled by the highly resourceful Friar Gregory and his friend Sir Morrough the Knight. Citations General and cited sources Clute, John, and David Pringle. "Heinlein, Robert A." The Encyclopedia of Science Fiction. Eds. John Clute, David Langford, Peter Nicholls and Graham Sleight. Gollancz, 22 Oct. 2014. Accessed 27 Oct. 2014. Holdstock, Robert, ed., Encyclopedia of Science Fiction, London: Cathay Books, p. 109, , 1978. Tuck, Donald H. (1974). The Encyclopedia of Science Fiction and Fantasy. Chicago: Advent. p. 215. . Warren, Bill. Keep Watching the Skies: American Science Fiction Films of the Fifties, 21st