Voyage to the Bottom of the Sea (1964)

S4E24 Edge of Doom

Title: Edge of Doom Plot: "Fools!!!" Admiral Nelson mutters to himself, suspecting an imposter aboard the Seaview, with Lee Crane as the prime candidate. Trusting nobody, he confides in Morton and Sharkey, devising a series of tests to determine Crane's true identity. The captain faces immense challenges throughout this ordeal. Nelson intentionally wounds his pride, Crane nearly suffocates in a fire within the Circuitry Room that he’s unjustly blamed for, and he finds himself confined in a storage area. Despite the relentless pressure from the Admiral, Morton, and Sharkey, Crane clings to his self-confidence.