The Omega Man (1971)
Robert Neville, a doctor, due to an experimental vaccine, is the only survivor of an apocalyptic war waged with biological weapons. The plague caused by the war has killed everyone else except for a few hundred deformed, nocturnal people calling themselves "The Family". The plague has caused them to become sensitive to light, as well as homicidally psychotic.
Links: IMDb, Posters
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