Bob, Tim and Jean are in Normandy to help drive ambulances for the Red Cross, a dangerous job in and of itself. However, the Terror Twins learn of a new Nazi super weapon: a 50-ton robot bomb capable of killing thousands and leveling London, having a crusing range of 5000 miles and a speed of 300 m.p.h..; The Terror Twins must battle a new Japanese secret weapon: the Ultra-Short Frequency Beam, effective up to a radius of 500 miles. The Japanese hope to demoralize the U.S. Navy and then invade the U.S. mainland.; Bob reads a story about an expedition to Africa that uncovers a gorilla 40 feet high! However, an evil doctor, creator of chemical hypnotism, hopes to use the process on the gorilla and bring him under his total control.; Young Jimmy wants to be involved with detective work, but his father has different ideas.