Slowly, by creating duplicates of Earth humans in key positions and locations, they enabled the true Martians (never seen or shown) to take over the planet almost without firing a shot. The story focuses on the family of one scientist, a man capable of understanding and perhaps turning back the invasion. But from the start, his own brother is compromised, and it seems that even he had been replaced prior to this, his new replacement having full knowledge of the invasion, which the deep cover original duplicate did not, unwittingly gathering information the invaders could use. Despite cleverness and fierce resistance, the Martian planners and their pawns have done too good a job in setting everything up. In the movie's ending, shocking for its era, the scientist, his wife, their teenaged da