In "Godzilla vs. Mechagodzilla" (1974), the King of Monsters confronts a mechanical doppelgänger constructed by alien invaders aiming to conquer Earth. As Mechagodzilla wreaks havoc, Godzilla teams up with the mystical King Caesar to thwart the extraterrestrial threat. This film combines sci-fi elements with classic kaiju action, delivering a memorable showdown between Godzilla and his robotic counterpart.