THE INVASION BEGINS! After the apparent demise of 'Ming the Merciful,' Flash Gordon, Dale Arden and Dr. Hans Zarkov continue their attempts to return to Earth. Meanwhile, Prince Barin, King Thun and Prince Vultan are hard at work trying to create a peaceful new environment on Mongo. However, when a mysterious group of Earth soldiers violently invade the planet, our heroes are separated and must band together once again to save the lives of every race on Mongo!