An Alien Invasion story with a difference, rather than destroy the planet they try to buy it.
There is a certain similarity with The Body Snatchers by Jack Finney but there is also an element of social commentary and its a great pity it was never made into a film back in the 1960s as it could have been one of the Film Noir Sci-Fi classics.
Recommended to lovers of the original Twilight Zone series.