John Howard as Captain Hugh C. Drummond

Heather Angel as Phyllis Clavering

H.B. Warner as Colonel Nielsen

Reginald Denny as Algy Longworth

E. E. Clive as Tenny

Jean Fenwick as Lady Beryl Ledyard

Zeffie Tilbury as Aunt Meg

George Zucco as Rolf Alferson

Leonard Mudie as Richard Gannett

Evan Thomas as Smith

Clyde Cook as Constable Sacker

David Clyde as Constable McThane

George Regas as Soongh

Neil Fitzgerald as Sir Malcolm McLeonard

Claud Allister as Sir Basil Leghorne

Ferdinand Munier as Old Major Trumleigh

John Sutton as Inspector Tredennis

John Davidson as Gumba, Bird Seller

John Rogers as Guggins, Scrawny Henchman

Jimmy Aubrey as Steward

Frank Baker as Cop

Billy Bevan as Aquarium Guard

Forrester Harvey as Constable at Gannett House

Eugene Jackson as Hotel Page Boy

Ruth Rogers as Maid

Harold Garrison as Native Boy with Message

Frank Lackteen as Native Selling Rifle

Steve Clemente as Native Buying Rifle

Kathryn Bates as Tourist

Neil Craig as Tourist

Grace Hayle as Tourist

Gerald Rogers as Island Police Desk Sergeant

Olaf Hytten as Island Police Arresting Sergeant

Sam Savitsky as Foreign Agent

Hercules Mendez as Foreign Agent