Doomsday Machine began production in 1967 under director Herbert J. Leder, first circulating under the titles Armageddon 1975 and Doomsday Plus Seven. The production stalled before the film was completed, apparently because its financing collapsed, leaving the unfinished material in storage for several years. When work resumed in 1972, the filmmakers no longer had access to the original cast, costumes, or sets. Rather than abandon the project, they attempted to finish it around the surviving footage, creating a science-fiction film whose second half visibly belongs to a different production era. In the extended sequence involving astronauts Danny and Major Bronski boarding a derelict Soviet spacecraft, replacement performers appear in altered spacesuits, their helmets conceal their faces, and their dialogue is delivered in different voices. The film never openly explains the transformation, turning an economic salvage operation into one of its strangest visual mysteries.
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