Routine tests on a traffic accident victim lead to shocking discoveries when the man's blood is found to be unidentifiable and x-rays reveal a disc embedded in his brain. His fabulous tale of being an escaped prisoner from an alien spaceship takes a turn for the sinister when the hospital staff realise that they're under a state of siege...
as Dr. Mike Vernon
as Leader of the Lystrians
as Dr. Claire Harland
as Brian Carter
as The Lystrian
as Nurse Lim
as Major Muncaster
as Lawrence Blackburn
as Police Sergeant Draycott
as Sister Evans
as Barbara Gough
as Sister Kelly
as Ted
as Harry
as Morgan
as Sergeant Williams
as Lloyd
as Elaine
as Lorry Driver
as Old Joe
as Telephone Operator
as Dundy
