Tense and haunting throughout (POSSIBLE SPOILER IN THIS COMMENT)A haunting feeling grips me every time I see this film. The alien threat is vividly brought home via the etheral choir background music. The point where the protagonists approach the end of the picket fence where a hole in the sand waits for them is the stuff my childhood nightmares. Although cheaply made in parts (some of the troop scenes were, I believe, taken from wartime footage), the overall effect never loses its tension. The Cold War theme predominates with characters being 'brainwashed' by having electronic devices inserted in the back of their necks through which the martians control them. Their change in character is apparent to others, especially the boy. This is reminiscent of The Manchurian Candidate and Invasion of the Bodysnatchers, where, as in Invaders.., the are used as agents to be sent on sabotage and espionage missions.
The arrival of the army to put things right - which they do - always leaves me with a great sense of relief and well-being. But, were the events real or a dream? You make up your mind!