The Phantom Submarine U-67

Alan Hale Sr. plays an American navy officer who allows German sub commander Peter Erkenlez to escape prosecution at the end of WWI. But Hale soon changes his mind when he discovers that Erkenlez was responsible for the death of Hale's wife, who drowned when her ship was torpedoed. Thereafter, the gloves are off, and a terrible revenge is extracted. The Sea Ghost bears traces of the famous 1919 seafaring melodrama Behind the Door, though the villain is spared the grisly fate of Wallace Beery in the earlier picture. Laura La Plante, in one of her final starring features, is cast as Hale's peacetime sweetheart.