The Human Duplicators

A chilling sci-fi horror film from 1964, "The Human Duplicators" follows an alien named Dr. Kolos as he is dispatched to Earth by the Intergalactic Council to replace select humans with android duplicates in a bid for galactic domination. However, his plan fails when an investigator from the US National Intelligence Agency destroys the androids, ultimately leading to Kolos' downfall and a surprising twist: he too is revealed to be an android, rendering his mission a failure.