A quartet of murderous psychopaths break out of a mental hospital during a power blackout and lay siege to their doctor's house.
Jack Palance
as Frank Hawkes
Donald Pleasence
as Leo Bain
Martin Landau
as Byron "Preacher" Sutcliff
Dwight Schultz
as Dan Potter
Erland van Lidth
as Ronald "Fatty" Elster
Deborah Hedwall
as Nell Potter
Lee Taylor-Allan
as Toni Potter
Phillip Clark
as Tom Smith / Skaggs
Elizabeth Ward
as Lyla Potter
Brent Jennings
as Ray Curtis
Gordon Watkins
as Detective Burnett
Carol Levy
as Bunky
