Doomsday Machine is one of those productions whose troubles read like a horror memo from low‑budget filmmaking: principal photography began in 1967 under director Herbert J. Leder (originally titled Armageddon 1975 and Doomsday Plus Seven), then simply stopped — footage went into storage and the picture sat unfinished, apparently for lack of money. When producers resurrected the project in 1972 they did so without the original cast, costumes or sets, and the result is a patchwork movie literally spliced together from whatever footage and stock material could be scrounged. NASA launch clips (badly degraded), special‑effects inserts lifted from David L. Hewitt’s The Wizard of Mars (1965 — Hewitt even receives a special‑effects credit) and even shots borrowed from the Japanese film Gorath (1962) were stitched into the new cut, creating jarring continuity errors — the external appearance of the spacecraft Astra inexplicably changes several times over the running time.
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