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Mantley, John

Entry updated 12 September 2022. Tagged: Author, Film, TV.

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(1920-2003) Canadian-born US screenwriter and producer whose Near Future sf novel, The Twenty-Seventh Day (1956; rev 1956), features Galactic Federation Aliens who give each of five humans from opposing countries an invincible weapon in 1963 to see what they do with them. The novel was filmed – from the US version, which has a revised ending – as The 27th Day (1957). Mantley wrote teleplays for The Outer Limits and The Wild, Wild West, and for years worked as a producer on Gunsmoke; he also produced the second season of the 1979-1981 television series Buck Rogers in the 25th Century. [PN/JC]

John Truman Mantley

born Toronto, Ontario: 25 April 1920

died Sherman Oaks, California: 14 January 2003


  • The Twenty-Seventh Day (London: Michael Joseph, 1956) [in the publisher's Novels of Tomorrow series: hb/Peter Curl]
    • The 27th Day (New York: E P Dutton, 1956) [rev vt of the above: hb/]


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