Godzilla vs. Mechagodzilla (1974)

"Flying through space and firing missiles! A dreadful Godzilla, whose whole body is a weapon, appears!"

Plot Summary

An Okinawan prophecy that foretells the destruction of the Earth is seeming fulfilled when Godzilla emerges to return to his destructive roots. But not all is what it seems after Godzilla breaks his ally Anguirus's jaw. Matters are further complicated when a second Godzilla emerges, revealing the doppelgänger as a mechanical weapon.