Assisted by the lovely AGENT HEATHER and his robotic dog G-9, Gadget Boy tracks down the evil villainess SPYDRA as she careens through Time with her hapless henchmen, stealing, plundering, and changing significant historical events for her own gain. With Spydra on the loose, nothing is safe from - from the Opal Mines of Australia, to the ancient Phoenician's moveable sail, to the discovery of fire.