Five years have passed since humanity learned about the existence of giant god-like monsters
known as Titans.
Paleobiologist Emma works for an organization known as Monarch to research the Titans and
develop her invention called ORCA, which is a sonar capable of emitting frequencies only
Titans can hear.
She lost her son during the last monster attack and the grief destroyed her marriage, so now
she's the sole caretaker of her daughter Madison.
One morning, the excavation site in China where they've been living begins to shake.
Madison and Emma rush to the lab and watch in awe how a giant glowing egg gives birth
to Mothra, a moth-like Titan.
The scientists activate a containment field to keep her caught but the system begins failing,
apparently because someone hacked them.
The guards panic at the sight of the monster breaking free and fire at Mothra, who immediately
panics and begins attacking everyone in her path.
Emma decides to take a risk and enter the enclosure to use ORCA, and in a few seconds,
the sonar frequency is calming Mothra down.
An excited Emma follows her mother and gets to gently touch Mothra's face.
The moment is suddenly interrupted when an eco-terrorist group led by former-colonel
Jonah break into the facility with a huge explosion and begin killing the entire team,
only leaving Emma and Madison alive.
Meanwhile Monarch's top scientist Doctor Serizawa and his assistants are attending a senate
hearing to try to convince the world leaders that the Titans are essential to the maintenance
of Earth's ecosphere and that some of them are capable of peacefully coexisting with
humans.
However most of the leaders are still set on killing the Titans.
When Serizawa gets a message informing him about the incident in China, the trio leaves
without finishing their arguments.
Moments later, they're meeting with Emma's ex-husband Mark to ask for his help.
Mark is hesitant to rejoin Monarch because he quit after they failed to protect his son
during the last attack, but he accepts when he learns that Jonah kidnapped Emma and Madison
and that he'll use ORCA, which Mark helped develop, for evil purposes.
The team takes Mark to their underwater base where they study and keep track of Godzilla,
the king of the Titans.
They learned that Mothra managed to escape Jonah's men and she has cocooned herself underneath
a waterfall miles away from the site.
Their intel suggests Jonah wants to capture Mothra, but Mark points out it's just a decoy:
now they have ORCA, they can release all the monsters, and that's why they should kill
them first, but Serizawa still refuses.
Meanwhile Emma and Madison are taken to another Monarch base in Antarctica, where Jonah's
men kill all the employees in order to gain access to the titan Ghidorah, also known as
Monster Zero, who is frozen in ice.
Jonah orders his men to start drilling into the ice and fill the hole with explosives
while Emma gets ORCA ready.
Back to the underwater base, the group begins feeling the whole structure shaking, which
hasn't happened since the last attack.
The team discovers their drones are being destroyed and that a titan is coming closer,
but Mark advises them to put down their weapons because it'll only make matters worse.
They open the shields to prove they aren't a thread and everyone is surprised to see
Godzilla just outside their window.
The titan is putting up a light show as some kind of intimidation display, and after giving
the building one big shake, he leaves.
Mark thinks Godzilla feels threatened by something and checks the titan's territorial routes,
coming to the conclusion Godzilla is going to Antarctica.
The team takes off while they explain to Mark that Ghidorah used to be a rival alpha to
Godzilla and they battled for dominance over the other Titans.
When they make it to the frozen base, the Monarch soldiers quickly make it inside, only
to be ambushed by Jonah's men.
A firefight immediately ensues and when Mark sees his family on the video feed, he decides
to join the battle too.
A Monarch sniper manages to kill the guy with the detonator, which falls to the ground,
while Mark meets with his family, asking them to come with him.
However Emma surprises him by picking up the detonator and activating the explosives, which
immediately causes the structure to start to crumble down.
As Ghidorah begins shaking inside the ice, the humans run away, and Emma joins Jonah
in a jet to regain access to ORCA.
While the base sinks into the frozen ground, Emma activates the sonar and finally wakes
up Ghidorah, who immediately begins attacking all the people surrounding him.
The soldiers try to retaliate with their weapons, but bullets do nothing and Ghidorah just breathes
a beam of bio-electricity at them.
The Monarch team tries to leave in their jet, but Ghidorah's electric attack has caused
all the electronic equipment to stop working and now they're stuck on the ground.
Desperate to help her dad, Madison takes the ORCA from Emma and changes the frequency to
get Ghidorah's attention.
When the titan turns to them, Emma takes ORCA back and turns it off, so now Ghidorah goes
back to attack the Monarch vehicle.
After a few hits, the team thinks they're hopeless, but at that moment Godzilla erupts
from the ice and begins fighting Ghidorah.
At first Godzilla clearly has the upper hand and lands an electric beam of his own, but
Ghidorah soon overpowers him and knocks Godzilla into the crater left by the explosion.
Then Ghidorah attacks Monarch again and eats Serizawa's assistant, but at that moment the
Monarch jet arrives and bombards the titan with missiles.
A stray missile explodes near Mark and knocks him out while Ghidorah flies away before Godzilla
can retaliate.
Sometime later, once Mark is feeling better he regroups with the others and analyzes the
information to learn Jonah's next target is a base in Mexico.
Suddenly they're contacted by Emma, who reveals she had been working with Jonah all along
because she wants to free all the Titans to restore balance to the world.
Humans are damaging the planet and will soon destroy it, but research has indicated that
the areas that the tians attacked last time are regenerating, meaning the monsters can
act as antibodies for the planet.
The Monarch team calls her out because her plan will cause millions of deaths around
the globe, but Emma just hangs up on them.
Then Monarch discovers that Jonah's team has shut down the containment system, so they
begin working on evacuating people at the town near the Mexican base.
Meanwhile Jonah asks Emma to use ORCA to awaken the Titan in Mexico remotely in the town,
and this time Madison tries to stop her because she didn't like the plan either.
Emma ignores her and activates the sonar anyway, sending the signals through the speakers in
town.
Soon the Mexican base explodes and Titan Rodan emerges from a volcano that immediately erupts.
Everyone in town runs away in panic while Monarch sends their jets to get Rodan's attention,
but the titan responds by flying above the town and wreaking havoc everywhere before
attacking the jets.
One by one each pilot falls dead to Rodan's fury, and when it's about to hit the jet,
Ghidorah shows up.
Both monsters clash in a vicious fight in the sky, and after exchanging a few hits,
Ghidorah overpowers Rodan and sends it to the bottom of the ocean.
Meanwhile the jet's hangar doors get hammed, so Mark risks getting closer to open it manually
and rescue one of their jets, which loses control in the way and crashes right into
the hangar.
At that moment the team gets a call from Admiral Stenz asking them to fly away because the
army has launched a weapon known as the Oxygen Destroyer to try to kill the Titans, ignoring
the fact Serizawa is against it.
With Rodan gone, Ghidorah turns his attention to the jet, but before it can attack, Godzilla
shows up and pushes Ghidorah into the water.
Now that Ghidorah can't fly, Godzilla gains the upper hand and rips off one of the titan's
heads.
Suddenly the Oxygen Destroyer strikes, killing all marine life within a two-mile radius.
Godzilla's vitals flatline and Monarch assumes he's dead, but Ghidorah emerges from the ocean
completely unharmed, then he lands on the volcano and regenerates his missing head.
With Godzilla gone, Ghidorah takes the role of the reigning alpha titan and utters a piercing
shriek that awakes all the dormant titans all over the world.
Destruction and chaos take over each location, not to mention the triggering of natural disasters
like earthquakes and tsunamis.
At the waterfall, Mothra's cocoon begins glowing and soon she emerges in a mighty new form
with beautiful wings.
Seeing all the destruction caused by her plan makes Emma have regrets, especially when Madison
calls her a monster and points out this isn't what her brother would've wanted.
The Monarch team analyzes Ghidorah's unnatural characteristics and by researching some old
myths, they realize Ghidorah is actually an alien and therefore an invasive species rather
than an enforcer of the natural order.
The purpose of Ghidorah's destruction may be to xenoform the planet to suit his own
tastes.
Moments later the team meets with Stenz and his army to explain that stopping Ghidorah
will stop all the other monsters as well, but no titan is powerful enough for the job
other than Godzilla.
Meanwhile Emma has also reached the same conclusions and tells Jonah she wanted cohabitation, not
extinction.
She wants to use ORCA and amplify it through a stadium to disrupt Ghidorah's control over
the Titans, but Jonah refuses because he thinks the world belongs to the monsters.
This whole conversation is heard through the comms by Madison, who decides to take the
matter in her own hands.
She steals ORCA and goes to Boston, which is already being evacuated by the military.
At the Monarch base, Mark intends to leave to find his daughter on his own, but at that
moment a bright light appears in the sky.
It's Mothra, who turns out to be the queen to Godzilla's king.
She keeps singing a song to get in contact with Godzilla, who is actually alive and recovering
underwater.
Mark points out Mothra will need help reviving him, so they send out a submarine to follow
her, only to get caught in a vortex that sucks them into the Hollow Earth tunnels.
They send out a bunch of drones and discover the ancient ruins of a civilization whose
hieroglyphs indicate that they peacefully coexisted with Godzilla and other Titans millennia
ago.
Godzilla is located resting in his lair, which consists of a volcanic chamber that has an
air pocket, feeding him energy to recharge him.
This process could take literally years, so they have to detonate a nuke to accelerate
the process.
Unfortunately the submarine's weapon system is offline, meaning someone will have to manually
place and detonate the warhead next to Godzilla.
Serizawa volunteers to do it and gives Mark his notebook before he says his final goodbyes
to his team.
Meanwhile all four branches of the military set out to attack Ghidorah, who is in the
process of completely destroying Washington DC with the help of a returning Rodan.
At that moment, Madison makes her way inside the stadium's press box and uses the ORCA
to broadcast the frequency through the speakers, causing all the Titans excluding Ghidorah
to suddenly cease their rampage and become docile, but this also attracts all of them
to her location.
In the ocean, Serizawa boards a miniature submarine and gets inside the air pocket,
where he leaves the warhead before approaching Godzilla.
The titan opens his eyes but doesn't attack, and Serizawa touches his face to say goodbye
to "his old friend".
The warhead then detonates, destroying the entire sunken city, killing Seriwaza, and
sending the submarine back to the surface.
Seconds later Godzilla emerges from the ocean completely healed and shoots out a blast,
ready to fight for his place as the titans' alpha.
He takes a moment to look at the team and decides they're allies before he leaves to
find Ghidorah.
This makes Mark realize that Emma combined the bioacoustics of Godzilla and humans to
create the ORCA's signal, so the monsters think humans are predators too.
They decide to follow Godzilla and join the fight.
At Jonah's base, Emma tries to leave to find Madison as well, and when the soldiers try
to stop her, Emma points her gun at Jonah.
Since the plan is already going well, Jonah decides to let her go.
In Boston, Ghidorah's arrival causes a hurricane that sweeps the whole city.
The titan begins attacking the stadium with energy beams and hits of his claws, so Madison
grabs ORCA and begins running through the corridors, dodging the beams and the debris
until she makes it outside.
She throws ORCA away and Ghidorah crushes it with a paw before turning to Madison, but
before he can kill her, Godzilla shows up and knocks Ghidorah down.
A new battle between both beasts begins, this time with the military providing cover fire
to distract Ghidorah and make him more vulnerable.
The clash of the titans triggers something in the sensors, and the team discovers the
warhead's radiation overcharged Godzilla: it makes him stronger but also he'll overload
in about twelve minutes, which will cause a thermonuclear explosion.
They quickly land the jet and go out looking for Madison, only to find the ORCA first.
Ghidorah manages to push Godzilla to the ground, but Godzilla retaliates with an energy beam,
and at that moment Mothra shows up and uses her silk to glue Ghidorah's heads to the side
of a tower.
This gives Godzilla the chance to tackle Ghidorah, only for Rodan to show up and fight Mothra
too, starting a fire in the city with its flame breath.
While the beasts fight around them, Emma also arrives and picks up Mark and the soldiers
in a jeep as they go looking for Madison, who is running in fear to hide in her old
family home, which is located right under the beasts' falling bodies.
Ghidorah finds the power grid and absorbs the electricity supply, enabling to him to
launch arcs of lightning from his wings that hit Godzilla, weakening him greatly and forcing
the military jets to retreat.
Rodan corners Mothra against a building, and Mothra takes the chance to use her stinger
to stab Rodan, hurting it so badly that it falls to the ground and can't get up.
When Mark and Emma make it to their old house, they're devastated to find it in ruins.
They desperately begin looking for Madison through the rubble and eventually find her
unconscious inside a bathtub, which saved her from the falling debris.
Madison quickly wakes up and reunites with her family as they watch how Ghidorah grabs
a weak Godzilla and takes him high in the sky before releasing him, causing Godzilla
to plummet through thousands of feet and crash to the ground.
Ghidorah prepares a beam to kill Godzilla, but at that moment Mothra puts herself between
Godzilla and the attack, which instantly vaporizes her.
Mothra's ashes rain down on Godzilla, transferring her energy to both heal him and block the
overload.
While Godzilla roars in grief for his companion, Ghidorah lifts him, ready for the final kill.
However Mark and Emma manage to activate ORCA again and the frequency gets Ghidorah's attention,
making him drop Godzilla and go after them instead.
The Monarch jet comes to pick the family up, but Emma decides to stay behind with the ORCA
to keep Ghidorah's attention on her instead of chasing the team.
Madison cries out as Emma drives away with the ORCA, guiding Ghidorah through the ruins
of the city until the titan hits the vehicle with his energy beams.
Emma rolls out of the car but isn't scared of Ghidorah when he approaches because at
that moment, Godzilla shows up glowing red thanks to the mix of radiation and Mothra's
ashes.
This new form makes him immune to Ghidorah's beams, and it allows him to shoot thermonuclear
blasts that incinerate Ghidorah's wings and two of his heads, but also Emma's body.
When Ghidorah falls, Godzilla steps on his chest and the stomp creates a huge explosion
that consumes the entire city.
Once the dust clears, Godzilla emerges back in his normal form with Ghidorah's last head
in his mouth.
After lots of struggle, Godzilla disintegrates the head with a beam, giving him victory and
the title of alpha.
Suddenly all the other Titans show up and kneel for Godzilla, accepting him as their
leader.
Rodan does try to look tough, but Godzilla makes it submit with just one look before
roaring to declare himself king again.
Sometime later, the titans behave benevolently under Godzilla's reign and return to their
nests to help rebuild the world's ecosystems.
Meanwhile Jonah and his men enter a secret warehouse in Isla de Mara, where fishermen
have founds Ghidorah's leftover severed head.
Jonah declares that he and his men should take it.