Adapted from the short story 'Goodnight, Mr James' by Clifford D. Simak, first published in "Galaxy Science Fiction" magazine in March 1951, later published as "The Night of the Puudly" in 1964 in a collection of Simak's short stories. The original story begins and ends with the "duplicate" of Henderson James, who awakes on a street in an unnamed city with a mission to kill an alien called a Puudly. Using telepathy the Puudly informs "duplicate" James of his origins as a clone, before James kills it. James then decides to attempt to talk the real Henderson James into letting him live. The clone of James arrives at Henderson James' home just after the gardener (whose job it is to kill the clone) has mistakenly killed the real James instead. As the duplicate prepares to become the real James, he receives a phone call from Allen, the clone bootlegger, who advises him of the poison: "Like a time bomb. No antidote for it even if he found out somehow." The duplicate says "It was good of you to let me know." Allen replies, "Glad to, Goodnight, Mr. James." (source - The Outer Limits: The Official Companion (1986), page 343.)