A quartet of murderous psychopaths break out of a mental hospital during a power blackout and lay siege to their doctor's house.
When the lights go out, the terror begins.
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Story
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Top Billed Cast
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Jack Palance
Frank Hawkes
Donald Pleasence
Leo Bain
Martin Landau
Byron "Preacher" Sutcliff
Dwight Schultz
Dan Potter
Erland van Lidth
Ronald "Fatty" Elster
Deborah Hedwall
Nell Potter
LT
Lee Taylor-Allan
Toni Potter
Phillip Clark
Tom Smith / Skaggs
EW
Elizabeth Ward
Lyla Potter
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