Mekano, a radio-controlled mechanical man, is being fine-tuned by his inventor, Bill Foster, to do things never before dreamed possible. However, young Tommy Clark gets at the controls and accidently looses the robot on an unsuspecting public. Stopped by Foster, the Nazis learn of this invention and seek to capture it, and, from it, make an Army of such creatures to use in their war efforts.; Tim and Gladys sail to Ganavana to investigate Mt. Abengi becoming an active volcano again.