Gordon Harker

as Inspector Hornleigh

Alastair Sim

as Sergeant Bingham

Phyllis Calvert

as Mrs. Wilkinson

Edward Chapman

as Mr. Blenkinsop

Charles Oliver

as Dr. Wilkinson

Raymond Huntley

as Dr. Kerbishley

Percy Walsh

as Inspector Blow

David Horne

as Commissioner

Peter Gawthorne

as Colonel

Wally Patch

as Sergeant Major

Betty Jardine

as Daisy

O.B. Clarence

as Professor Mackenzie

John Salew

as Mr. Tomboy

Cyril Cusack

as Postal Sorter

Bill Shine

as Hotel Porter

Sylvia Cecil

Edward Underdown

Marie Makino

Richard Cooper

Noel Dainton

as Corporal

Arthur Denton

as Train Guard

Arthur Hambling

as Joe

Allan Jeayes

as Brigadeer Lloyd

James Knight

as Cinema Manager

Stuart Latham

as Mr. Jennings

George Street

as Stores Sgt