Mothra's History
Mothra was an ancient guardian of the Earth with one version having fought Gigan in the distant past and the other being the descendant of the Mothra that attacked Tokyo in 1961.
In the Tokyo S.O.S. timeline, Mothra was sighted flying over the skies of Japan, prompting two fighter jets to try and shoot her down. Mothra was unaffected by the jets' missiles and continued flying to Japan. Mothra landed near the home of Shinichi Chujo, a man who had helped reunite the original Mothra with her Shobijin in 1961. The Shobijin appeared to Chujo and asked him to tell the government to scrap the Kiryu project, which utilized the remains of the first Godzilla as a weapon. The Shobijin claimed this was a crime against nature and the sanctity of life, and that Mothra would be forced to declare war against humanity if the first Godzilla's remains were not returned to the sea. They also promised that Mothra would take it upon herself to defend Japan from Godzilla. When Chujo told his story to Prime Minister Hayato Igarashi, he regretfully told Chujo that the government could not afford to scrap the project, as too much had already been sacrificed for it. When Godzilla appeared in Tokyo, Chujo's grandson Shun used school desks to recreate Mothra's symbol and summon her to Tokyo. Mothra engaged in battle with Godzilla, but due to her old age was easily overwhelmed. Igarashi ordered Kiryu to be launched to aid Mothra, and the machine entered the battle as well. Godzilla defeated Kiryu, while the egg Mothra left behind on a remote island hatched into two twin larvae, much to the Shobijin's surprise. The larvae reached Tokyo and met up with their mother, who had been wounded in the battle and was now unable to fly. While the larvae were conversing with their mother, Godzilla fired his atomic breath at them. Mothra quickly jumped into the air in front of her offspring, absorbing the entirety of the blast and exploding in a burst of flames. The larvae were heartbroken at their mother's death, and after briefly mourning her they entered battle against Godzilla. The larvae were too small and weak to seriously hurt Godzilla, but Kiryu soon reentered the battle and seriously wounded Godzilla by drilling into his chest. The larvae took the opportunity to spit silk all over Godzilla, trapping him inside a giant cocoon. Godzilla fell to the ground, but rather than kill him, Kiryu simply flew with Godzilla out to sea and sank into the Japan Trench with him. Their mother's death avenged, the larvae returned to Infant Island with the Shobijin.
In the timeline of Final Wars, Mothra defended the Earth from an alien monster known as Gigan, defeating him and entombing him off the coast of Hokkaido thousands of years ago. In the year 20XX, the Earth Defense Force recovered Gigan's mummified remains, drawing the attention of Mothra and her Shobijin. The Shobijin appeared to several members of the EDF and warned them that Gigan was evil and could awaken, but promised that Mothra would appear to defend the Earth. When the alien force known as the Xiliens took control of Gigan and an army of monsters and used them to conquer the planet, Mothra flew to Tokyo to aid Godzilla in his battle against Monster X.
Soon after, the Xiliens sent out a newly modified Gigan, who now had twin chainsaws instead of scythes and a neck brace, to intercept Mothra. The two monsters circled and clashed mid-air under Tokyo Tower, and stared each other down. Mothra flapped her wings back and forth, creating hurricane-force winds that caused Gigan to skid back slightly. The cybernetic monster revved up his dual chainsaws, drove them into the ground, and sped towards Mothra. Just as he was about to ram her, Mothra dodged the oncoming strike by flapping her wings to raise herself higher into the air. Gigan suddenly drove his spiked tail into Mothra's abdomen, making her chirp in pain. The cybernetic monster then spun back around, sending Mothra flying. Gigan pursued her and slashed a portion of Mothra’s left wing off, causing her to plummet towards the ruins of Tokyo and crash.
As Godzilla struggled against the combined might of both space monsters, Mothra recovered and saved the King of the Monsters from being double-teamed by the enemy monsters and confronted Gigan once again. Gigan fired two razor discs at Mothra, but she used her reflective scales to avoid them. Gigan responded by blasting Mothra with his laser beam, causing her to erupt in flames. Believing himself victorious, Gigan turned around, only for his head to be sliced off by his reflected razor discs. Mothra, still on fire, flew into the headless Gigan and exploded, apparently killing them both.
