I really hope this has a similar outline to “Ghidorah, the Three-Headed Monster.” Godzilla is an alpha predator, and is awakened by the presence of Rodan escaping from its underground lair (feasting on some Meganulon who terrorized a mining company, because mine cave-ins are topical and “original Rodan origins”) but as they fight, Mothra awakens and starts storing energy to cocoon and transform (attacking a deforestation company because she needs her greens and also, guardian of earth.) Then we find out that Mothra is awake because of the threat of outside assaults to the earth. The space alien Ghidorah is coming, and Mothra has to convince Godzilla and Rodan to stop fighting to work together and defeat the horrible three-headed kaiju.
It’s great because more monsters means more monster destruction pacing of different magnitudes. Mothra as a caterpillar is small but still powerful and leaves a path of destruction wherever she goes like a mud slide. Rodan is airborne and does blanket damage (making wind gales that topple skyscrapers.) Godzilla is pretty careful (traveling by water to only make coastal damage and wrecks buildings when they’re useful for hurting enemy kaiju.) And then there’s Ghidorah who just kills, burns, smashes, and crushes everything in its path. Their paths would cover the globe and converge at one place of awesomeness.