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Episode Guide
- 1. Eleven Days to Zero Sep 14, 1964
- The Seaview crew must plant a nuclear device to prevent a devastating tidal wave.
- 2. The City Beneath the Sea Sep 21, 1964
- Crane investigates the mysterious disappearances of two research ships.
- 3. The Fear Makers Sep 28, 1964
- An enemy agent introduces a fear gas into the ventilating system.