A quartet of murderous psychopaths break out of a mental hospital during a power blackout and lay siege to their doctor's house.

Top Cast

Jack PalanceFrank Hawkes

Donald PleasenceLeo Bain

Martin LandauByron "Preacher" Sutcliff

Dwight SchultzDan Potter

Erland van LidthRonald "Fatty" Elster

Deborah HedwallNell Potter

Lee Taylor-AllanToni Potter

Phillip ClarkTom Smith / Skaggs