 On military base, Dr. Quest is working in a secret revolutionary new weapon, the Para-Power Ray Gun, a weapon that drain the power from any mechanical device and render it useless. Dr. Zin, very much interested in this project, sends a strange looking craft with a mysterious black sphere inside to land near the base. When the puzzled Quests have the sphere brought to the base for later examination, Dr. Zin soon engages the machine as a large spying robot to examine the secrets of Dr. Quest s weapon. Although Dr. Quest and Race catch it in the act, Dr. Zin brags that they cannot stop it from escaping. In the ensuing battle, the Quest family learns that their enemy was not bluffing with the departing machine literally shrugging off the most powerful blows against it. Can the Quest s find a way to bring the robot down in time?