I know the studio is already going in a different direction and aside from already telling us the monster cast, they will most likely try to make the story not bad. My issue with this is the last movie was then 90% boring because no one cares about B plot when there could be monsters on screen breaking stuff. The goal for any monster movie should be to put as much of the budget as possible into (computer) model cities to destroy. Anyways, lets get on with plot:
Godzilla’s Rampage
Movie starts with Godzilla reappearing for the first time since the last movie to destroy a city (I’ll pick Sydney for no good reason) the disappears back into the sea. The world loses it and settles on building a machine that can stop him. As the meeting a wrapping up, a UFO pops up outside and some aliens break in with a message ‘Hey, we hear you got monster problems. Our world has also been plagued by giant monsters and we have a way to deal with them. It’s a mind control devise but they need more testing before it can work on something the size of Godzilla.’
They hunt down a smaller monster, let’s say Baragon. and send it at Godzilla the next time he surfaces. Big G kills Baragon handily so the next plan is to grab two monsters to attack Godzilla, Anguirus and Rodan. Next fight is still pretty one sided. Things are looking bad for the two new comers until something else emerges from the sea, another Godzilla. And, the aliens proceed to freak out. The new one goes right to the first and they start fighting. Eventually the new one unleashes his breath on the old one, lighting him on fight. It dozes into the ocean to quench the flames and reemerges with it’s skin gone revealing the metal interior. Now, Mechagodzilla, Rodan and Anguirus all team up and start fight the real Godzilla. The government sees this and realizes the aliens set the whole thing up. They send some missiles or Kickass to go destroy the UFO. The succeed in destroying the transmitters quickly so Godzilla can stop getting 3v1′d. Mecagodzilla is stil a beast with missiles, lazer eyes and what have you and kills Rodan but the rest of the monsters eventually take it down and bail back to the sea. The assault against the UFO concludes with it getting destroyed but leaving earth with one last message. They weren’t joking about having a monster problem of their own. They just received word that their home world lead their strongest beast onto the teleporter that brought Mecagodzilla to earth and send it here because they couldn’t conquer the planet and it’s bigger and badder than Godzilla. End of movie.
Godzilla: A Challenge of Kings (I would also accept Godzilla: Royal Rumble with the tag line being ‘Who will be the true king of the monsters?’)
Everyone is still waiting for this new huge monster to make an appearance. The production on the weapon to stop Godzilla (dubbed the Super X) is almost complete.
They have learned to lure the monster with active nuclear subs.
Another group has tracked down a fabled monster island to see if anything that lives there can be lured to the location of the first attack. There they find a tribe worshiping a giant egg at the base of a volcano. They say the egg hatches Mothra every time the volcano erupts where it protects their village from the other invading monster that come to feed off the radioactive volcano.
Finally, King Ghidorah emerges and starts wrecking up the place. Godzilla and Anguirus and lead to it’s location and they fight the beast. Things do not go well as Anguirus is killed and
Godzilla collapses near death before Ghirdorah bails to heal it’s minor wounds. The government is conflicted on whether to try to use Godzilla again and risk the damage he could cause to to get ride of him while he’s weak. A general eventually goes rogue and fires a nuke at him after hearing the Super X is complete. This collapses the shore he lies on. Although no one can get close enough to confirm he is dead due to the radiation, Godzilla is assumed dead.
The volcano erupts shortly causing the egg to hatch three worms. The eruption also draws King Ghidorah to the island where he starts feeding off the volcano. The worms begin harassing him by spitting webbing at him. The government uses this distraction to launch Super X at Ghidorah. Between its freeze ray and the webbing, Ghidorah is finally trapped. The worms use this time to build a cocoon but the volcano is still erupting and begins both thawing and burning the webbing trapping Ghidorah. Finally free, it goes after the Super X damaging it badly. At this point, someone finally realizes that Godzilla’s corpse has disappeared. The nuclear fall out has regenerated him and he then pops up to take on King Ghidorah again. Both Godzilla and Ghidorah take great damage but heal quickly due to the volcano. The crew of the Super X realize this and turn their beam on the volcano finally halting it before they lose power. Finally, Mothra emerges from it’s egg. The dust from its wings is extremely flammable. Seeing this as a greater threat, Ghidora takes off and fights Mothra from the air, clipping it’s wings but losing flight itself and taking heavy burns. Godzilla finishes the job and Mothra uses the last of its strength to lay a new egg. Everyone is relieve the threat from space is over. End of movie.
Beyond this, maybe the aliens come back because we couldn’t find their teleport receiver or robots from the future try to engineer an apocalypse to get rid of humans through monster mutation of pollution. Hope you enjoyed.