The Earth Dies Screaming : a British 60s sci-fi film where a dastardly plot by aliens, who we never see, release a gas that kills virtually everyone on Earth. Cue a country village (Shere in Surrey) where a motley band of people, including an American for the export market, who have fortuitously escaped the gas gather in a hotel. They are then menaced by the slowest and least convincing robots (all two of them) ever to have been built.
Said robots have the ability to raise the dead as some sort of proto-zombies. In fact they just forced the actors to wear weird contact lenses and following the lead of the robots, walk menacingly slowly trying to kill the protagonists - defenceless women in the main.
The denouement matches the rest of the film : the ubiquitous American figures out that the aliens are controlling the robots by means of radio waves via a transmitter, which is conveniently located little more than a mile away. How he figured it out was a mystery, but nevertheless he did and blew up the transmitter. Thankfully it lasted little over an hour ; to save you watching it the trailer condenses it in two and a bit minutes.