Joseph Cummins (played by Jim Davis) is a protagonist in Keep 'Em Sailing.
FBI Director Sinclair (played by Ian Keith) appears in Keep 'Em Sailing.
Rucca (played by George Travell) appears in Keep 'Em Sailing.
Hugo Stregel (played by Frederick Worlock) appears in Keep 'Em Sailing.
Mitchell (uncredited) (played by Stanley Andrews) appears in Keep 'Em Sailing.
FBI Chemist (uncredited) (played by Hugh Beaumont) appears in Keep 'Em Sailing.
Gruning, Stregel's Henchman (uncredited) (played by Ian Wolfe) appears in Keep 'Em Sailing.
Pelly, Stregel's Henchman (uncredited) (played by Byron Foulger) appears in Keep 'Em Sailing.
