- MANTLEY, John (Truman)
- (1920-)Canadian-born US screenwriter and producer whose sf novel, The Twenty-Seventh Day (1956 UK; rev 1956 US), features Galactic Federation aliens who give each of five humans from opposing countries an invincible weapon 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 2nd season of the 1979-81 tv series BUCK ROGERS IN THE 25TH CENTURY.PN/JC
Science Fiction and Fantasy Encyclopedia. Academic. 2011.