Thread:The Reptile King/@comment-25808351-20181209032549/@comment-27950421-20181210002403

It is for the most part a single ghidorah that keeps coming back. The guy holds a grudge. We know of at least 4 who have come to earth.

King Ghidorah, the guy you are familiar with, who just keeps coming back for another round.

Death Ghidorah or Desghidorah who is responsible for what happened on Mars. He was sealed by Mothra and imprisoned on earth in stasis.

Grand King Ghidorah who killed off the dinosaurs before being chased off by a primitive iteration of Mothra before coming 65 million years later to finish the job. That guy was so strong that even in his Rainbow form Mothra Leo couldn't beat him and so he had to break the light speed barrier, go back to the cretaceous and beat the shit of Grand King Ghidorah in his younger form to weaken the elder form enough for Mothra Leo to win in his Armor and Eternal forms.

and Kaiser Ghidorah the final foe of Godzilla Final Wars.

You also have to take into account that Godzilla doesn't have a single continuity so what applies in one set of movies doesn't apply elsewhere.