Jack Livingston

as Ward Hutton

as Gene Stratton

as Douglas Ferguson

as Bob Harvey

as James Norvall

as Claude Roberts

as Dave Langdon

as Dr. George Wainright

as Dr. Niblock (as Jack Livingstone)

as Randolph Shaw

as Reginald Dunstan

as Grant Barton

as Karl le Barron

as Carey Larned

as Noel Clavering

as Calvin Stone

as Jim Gordon

as Captain Drake

as Donald Luther

as Patrick McCree

as Charles Lunkin

as Dr. Howard

as Capt. James Morrison

as Sid Wilson