An underwater research vessel, the Mini-SGS was first utilized for the exploration of Tokyo, which had experienced massive flooding from some unknown cause. The operators of the device couldn't believe their eyes when the images began to pour in of an immense underwater nest of Meganula eggs! As the machine continued to explore the submerged city, the miniature probe experienced an electrical malfunction. Megaguirus, the terrible queen of the Meganula, was the bane of this disturbance. She rose into the air, her jagged frame and hateful eyes casting a glimpse of death in the night sky. Her quarry was Godzilla; she was determined to avenge her hive...