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Invasion of the Body Snatchers Production Novel and Screenplay Jack Finney published the original source material for the screenplay in three issues of Collier's magazine: November 26, December 10, and December 24, 1954. The resulting book, The Body Snatchers, was published in 1955, and republished in 1961 under the title The Invasion of the Body Snatchers. Two weeks after the third issue was released, Walter Wanger, Don Siegel, and Daniel Mainwaring met to discuss the film adaptation with Finney. Mainwaring drafted a screenplay in less than six weeks; Richard Collins rewrote for a week "although the extent of his contribution is unclear."