The Third Visitor

Sonia Dresdel

Steffy Millington

Guy Middleton

Inspector Mallory

Hubert Gregg

Jack Kurton

Colin Gordon

Bill Millington

Karl Stepanek

Richard Carling

Eleanor Summerfield

Vera Kurton

John Slater

James C. Oliver

Michael Martin Harvey

Hewson (as Michael Martin-Harvey)

Cyril Smith

Detective Horton