Seaview encounters a sunken WWI sub...with someone still left aboard.

A 16th century pirate seemingly comes back from the grave to threaten Seaview.

Captain Krueger returns to compel Nelson to shoot Crane. Once that is done, Krueger takes over Crane's body and searches out a host for Lani, Krueger's dead lover, so the two can be reunited. Can Admiral Nelson save his friend and end the plans of the evil Captain forever?