as Duke Sheldon
as Paul
as Hap Hurley
as Specs Green
as Mr. Gregory / Lane Talbot
as Manfred 'Doc' Montague
as Adm. Moffett
as Dr. Wayne Talbot
as Holden, Cyril Gordon
as T.N. Thompson / Mr. Dynamite
as Himself
as Harwood
as Thomas Ignatius 'Tom' Fletcher
as Sergeant Quirt
as Ralph McCormick
