John Barrymore

as Colonel Neilson

John Howard

as Captain Hugh 'Bulldog' Drummond

Louise Campbell

as Phyllis Clavering

Reginald Denny

as Algy Longworth

E. E. Clive

as Tenny

Porter Hall

as Dr. Botulian

Elizabeth Patterson

as Aunt Blanche

Nydia Westman

as Gwen Longworth