Ten trucks, all equipped with powerful atom bombs, are set loose in Washington D.C. when a Russian scientist escapes from behind the Iron Curtain with atomic secrets for the U.S.
When an ex-Nazi scientist discovers how to cause torrential rain and floods in any part of the world at any time, he selects parts of America to carry out his scheme. The Atom Squad sets out to find the cause of the flooding.
Elliott and Fielding unravel the secret of the worlds largest underground structure, the Cinco Caverns, as they face death 1,000 feet below the earth's surface.