Voyage to the Bottom of the Sea : The Saboteur (1965)
Directed by Felix E. Feist
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Synopsis by Bruce Eder
Captain Crane (David Hedison) is kidnapped and brainwashed by an enemy power, and then returned to the Seaview. helpless to resist the programming imposed on him. His mission is to deactivate a group of defensive missiles, and to kill Admiral Nelson (Richard Basehart).