As I remember it, the protagonist is looking inside his window late at night at himself inside his house/apartment. Only over the course of the story does he realize that he is a clone created to kill some animal (possibly alien).

The plot of this short story likely served for the inspiration for 'The Sixth Day' with Arnold Schwarzeneggar.


This sounds like an Outer Limits episode called "The Duplicate Man", first aired in 1964. (Clone created to kill an alien animal, doesn't know he's a clone at first, I think I even remember the window part).

It was based on "Good Night, Mister James", a novelette by Clifford Simak, published in 1951, available at the Internet Archive.

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    Agree about "Mr. James". Great ending. – Organic Marble May 15 '19 at 0:11
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    Yes, that was going to be my answer. However, seeing as the OP wrote "short story", not "television show", it seems likely that he was thinking of the original short story, not the adaptation.. "Good Night, Mr. James" was also the (unaccepted) answer to this old question. The story is available at the Internet Archive. – user14111 May 15 '19 at 0:18
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    This was definitely the story I was thinking of, I had no idea it was also an Outer Limits episode, I will check that out! – John R May 15 '19 at 0:20

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