1998, the year it attacked.....
Zilla, a subspecies of Godzilla was discovered and killed by the military.
as much as monarch and other researchers tried to stop the death and instead try to attempt to relocate the creature it was no use.
Zilla was commonly mistaken for a mutated iguana but was later discovered to be an ancient creature from thousands of years ago.
Monarch was smaller back then but is now so big it has at least 5 outposts in every country and even more at sea.
after the 2019 events that shook the world more and more titan activity began. even in the hollow earth ghidorahs reawakening was heard of and feared all that way underground and that's where our story begins. the hollow earth 1998