The Ghost of Moby Dick

An old friend of Nelson's comes aboard Seaview to continue his research into the giant whale that destroyed his ship, crippling him and killing his son. His real motives, however, have more to do with vengeance than science, and Crane becomes concerned that the Admiral is caught up in his friend's obsession.

Nelson y el Seaview ayudan a un científico a encontrar una ballena gigante con el propósito de realizar con ella estudios que beneficiarán a toda la humanidad. Sin embargo, lo único que mueve al científico es un afán de venganza: culpa al animal del hundimiento de su barco y de la muerte de su hijo.