One of those Shōwa era appearances was Godzilla vs. Gigan. The plot of that film had a pair of extraterrestrials take over the body of a deceased teacher and his favorite student. Their goal?

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 ...

Gigan: This beast can be an intimidating force with his buzz-saw weaponry in his abdominal region and his steel hooks in place of hands and feet. Godzilla first mixed it up with him when Gigan was ...