toward Godzilla, whom he blames for the death of his son during the events in San Francisco, but eventually agrees. The Monarch team follows Godzilla to Antarctica, where Jonah plans to free a three-headed Titan codenamed "Monster Zero." Emma frees and awakens Monster Zero, who battles Godzilla, devours Graham, and escapes. The team later realizes that Emma is working with the terrorists. From a Monarch bunker in Boston, Emma contacts Monarch and argues that the Titans must be awakened to heal the Earth from the damages that humans have caused. Emma awakens Rodan in Mexico, and the Monarch team lures it towards Monster Zero. After Rodan is defeated, Godzilla ambushes Monster Zero and severs his left head. During the fight, the U.S. Navy launches a prototype weapon called the "Oxygen Destroyer," seemingly killing Godzilla. Unaffected, Monster Zero regrows his lost head and awakens all the other dormant Titans worldwide, with Rodan submitting to his rule. As a result, Madison disowns Emma. Through mythological texts, Dr. Ilene Chen discovers that Monster Zero is King Ghidorah, a prehistoric alien seeking to transform the Earth. Mothra emerges from her cocoon and flies to Monarch's Bermuda base to communicate with Godzilla, who is recuperating in an ancient underwater city. The team locates Godzilla's lair in a submarine, which is highly radioactive. They deduce it will take too long for Godzilla to heal on his own and decide to detonate a nuclear warhead to speed up the process. Serizawa sacrifices himself by manually detonating the warhead, reviving Godzilla, and increasing his power. Emma realizes the destruction Ghidorah and the other Titans will bring to the world is far worse than anything humans could inflict, but Jonah ignores her pleas to stop. Madison overhears this and steals the Orca. Arriving at Fenway Park, Madison broadcasts a frequency that calms the Titans but unwittingly attracts them all to her location. Ghidorah lands in Boston to destroy the Orca. Godzilla arrives to engage him in battle with Monarch personnel's assistance. Mark leads a team to rescue Madison and escape the city after learning Godzilla's radiation levels are increasing and will lead to a thermonuclear explosion. Mothra arrives to help Godzilla but is intercepted by Rodan; she defeats him but is injured in the process. Ghidorah overpowers Godzilla and prepares to kill him, but Mothra sacrifices herself and transfers her energy to Godzilla. Mark, Emma, and Madison are reunited