The story begins with a new sub, the Polidor, being put through its paces. It should be a great sub...able to go to amazing depths thanks to the Admiral. However, oddly, the crew begins losing their cool and the sub explodes...and it's all overheard by Admiral Nelson and his crew. Some think the accident was an accident...no one is prepared to learn the truth...that Dr. Kenner's new 'Fear Gas' was responsible for turning the crew of the Polidor into scaredy cats. Now, the man who released the gas, Davis (Lloyd Bochner) is aboard the Seaview and is preparing to release the gas once again in some twisted sort of experiment.
This was a pretty exciting and, most importantly, original episode. Also, I loved that Dr. Kenner was played by Edgar Bergen...of Bergan and Charley McCarthy fame!