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Watch Voyage to the Bottom of the Sea Season 4 Episode 12 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Voyage to the Bottom of the Sea: The Seaview is en route to rendezvous with the fleet when Sharkey reports a missile fuel leak. Crane and Morton believe it's worth returning to port to repair, however Nelson knows how to handle it. Taking a small breathing device with him, the Admiral locks himself in the compartment in question to effect repairs. However, he drops a wrench, the circuits blow and Nelson is knocked out. When he comes to, he's gripped by paranoia which worsens with each passing minute. Trusting no one, Nelson loses his grip on reality, arresting Doc, fighting with Sharkey and finally launching a nuclear missile at the fleet!