Terror of Mechagodzilla (1975)
Plot Summary
Aliens from a dying galaxy plan to destroy our cities and build their
new home on Earth. Their weapon is Mechagodzilla, a 400-foot-tall robot
armed with powerful lasers and guided missiles. Only Godzilla is mighty
enough to stop the colossal machine, but when Professor Mafune (Akihiko Hirata) joins the
aliens, not even Godzilla will be able to defeat them. Mafune controls
Titanosaurus, a gigantic amphibious dinosaur, through a biochemical
connection with his cyborg daughter, Katsura. (Tomoko Ai) Godzilla is no match for
Titanosaurus and Mechagodzilla together, but Interpol agents have
discovered Titanosaurus' weakness, which may give Godzilla the fighting
chance he needs to save the world!
Godzilla vs Mechagodzilla (1974)
Plot Summary
Aliens intend to take over the planet and, just in case Godzilla tries
to interfere, have built a mechanical version of him to put an end to
his interference. The Earth humans summon the legendary King Caesar to
assist Godzilla in the battle.
Godzilla vs Megalon (1973)
Plot Summary
The underground kingdom of Seatopia sends out Megalon, a giant beetle,
and Gigan to destroy the above ground dwellers. In an attempt to stop
them, an independently thinking robot brings Godzilla into the fight.
Godzilla Vs. Gigan (1972)
Plot Summary
Aliens from space plan to conquer the world using space monsters Gigan
and King Ghidrah, which they control from their secret headquarters
inside the head of the Godzilla-replica building at a theme park. The
only thing that can stop them is the combined efforts of Godzilla and
Anguirus.
Godzilla Vs Hedorah/Godzilla Vs The Smog Monster (1971)
Plot Summary
A pollution monster named Hedorah comes from outer space. First it
terrorizes sea, then it goes on land where it encounters the big G.
After it's after intial fight with Godzilla it retreats, only to reappear
again in a flying form, it then starts to kill people. Finally, it takes on
it's final form, that's when the Big G comes and the battle that decides
the fate of the world begins