Voyage to the Bottom of the Sea

The Ghost of Moby Dick (1x14)

Air date: Dec 14, 1964

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.