Voyage to the Bottom of the Sea : Long Live the King (1964)
Directed by Laslo Benedek
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Synopsis by Bruce Eder
When the king of a small nation is assassinated, the Seaview gets the mission of conducting the young Crown Prince home. The mission, and the need to protect the boy, is made all the more difficult by his unhappiness, and Nelson and Crane's inability to communicate with him. When the sub picks up a mysterious old man (Carroll O'Connor) at sea, he provides the boy with the companionship he needs, as well as some unexpected guidance.