Nazi spies are out to destroy a new submarine killer, the "Firefly", being developed by the British navy.
George Formby - George Blake
Anne Firth - Pat
Reginald Purdell - Birdie Edwards
Peter Murray-Hill - Shapley (as Peter Murray Hill)
Manning Whiley - Church
Hugh Dempster - White
Dennis Wyndham - Black
Charles Farrell - Jim Bennett
Eliot Makeham - Johnson
Peter Gawthorne - Adm. Sir William Coltham
Jane Welsh - Rita
Frank Atkinson - Harry
Noel Dainton - Sub-Lieutenant Barnes
Ian Fleming - Lt. Cmdr. Carter
Harry Fowler - Boy on Bicycle
Charles Hawtrey - BBC Man
Bryan Herbert - Doctor
Mike Johnson - Steward
George Spence - Sailor in Marching Contingent
Harry Terry - Sailor Cuddling Girl
Jack Vyvyan - Chief Petty Officer
Director - Marcel Varnel
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