In the real world

In the Kaiju Multiverse

• Aliens from the Third Planet of the Black Hole unleash a robotic clone of Godzilla, a Mechagodzilla, apon Japan. Godzilla, along with an ancient guardian monster called King Ceasar, fight and destroy Mechagodzilla and thwart the alien's invasion plans.
• A nuclear submarine crashes in the Berring Sea, and its radioactive core leaks and irradiates a Godzillasaurus that had been relocated their by time travelers 30 years earlier. The creature mutates into a second Godzilla and gradually begins to gather streangth.