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You can watch The Astral Factor (1978) for free on Artiflix.

Demonstrating that a little knowledge is a dangerous thing, a convicted strangler studies the paranormal and finds a way to render himself invisible. Once he escapes, he sets out to find and eliminate five women who remind him of the mother he murdered. A police lieutenant sets out to safeguard them and bring the invisible killer to justice.

This low-budget relic trades hard sci-fi logic for a feverish, slasher-inflected nightmare about an invisible predator. It is a strange, unsettling collision of paranormal pseudoscience and ritualistic revenge.

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