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Terror of Mechagodzilla (1975)

IMDb: 6.2
1975

Attempts to salvage Mechagodzilla are thwarted, causing an INTERPOL investigation that uncovers the work of a shunned biologist and his daughter, whos life becomes entwined with the resurrected machine

Godzilla vs. Megalon (1973)

IMDb: 4.8
1973

An inventor creates a humanoid robot named Jet Jaguar that is seized by the undersea nation of Seatopia Using Jet Jaguar as a guide, the Seatopians send Megalon as vengeance for the nuclear tests that have devastated their society