1966: ‘Planet Of Fakers’ by J.T. McIntosh

Hertzsprung-Russell rating: F10^6.5+

Available in: The Twelve Frights Of Christmas

Aliens with the ability to mimic humans infiltrate a space colony, and the captain is forced to take desperate measures to figure out who’s who, and who’s an ‘it’. Do you have what it takes to be a captain? One of these blogs is an alien mimic. Figure out which one it is and eliminate it.