Ultraman Zearth's History
Ultraman Zearth is an Ultra hailing from the Land of Bright in Nebula Z95. He is featured in two eponymous films, Ultraman Zearth 1 and 2. Though prone to falling under the effects of his anxieties, resulting in times when his strength is severely impacted, Zearth is a skilled fighter with a remarkable set of abilities that place his strength as being on par to or greater than other Ultras.
An Ultraman from the Land of Bright in Nebula Z95, Zearth came to the planet Earth to defend it from the forces of evil, creating the human identity Katsuto Asahi, a member of Mydo, an Earth defense team that used a gas station as their secret base. As a result of him being the team's newcomer, as well as his fear of dirt, he was placed in the role of the base's janitor, and wasn't formally allowed to go on missions with his teammates. This occupation appealed to him, however, as his germophobia meant that he kept the base sparkling at all times. The fact no one took him seriously didn't bother him either, since as he was not allowed to go out on missions, it gave him the ideal opportunity to transform out of sight. When the dreaded Cotton-Poppe attacked Japan, Zearth transformed to practice in the Japanese countryside while Mydo searched for the monster. In one such training session, Zearth got dirt on his hand while practicing beam techniques in a canyon, desperately washing it off. Unknowingly, Zearth had let the evil Alien Benzene know of his phobia. Soon the alien used this to discover the truth about Katsuto and tormented him, showing up at Mydo's base in his own human form to gloat over Zearth's fear and torment him with it by rubbing engine oil on his face.
Benzene soon captured a group of children and Zearth's love interest with the intention of tricking Zearth into detonating Cotton-Poppe with his beam, releasing enough energy to blow the Earth to pieces, allowing Benzene to plunder the wreckage for all the gold he could carry. Mydo caught up with Zearth and warned him of the scheme. With an energy barrier set by Benzene blocking him, the only way to get to the hostages was to cross a huge pool of tar to rescue them.
Zearth tried to cross the lake, but his phobia manifested, and he rapidly began to grow weak. Beset by his fear, Zearth's Color Timer blinked rapidly as he continued to lose his strength, and as he disappeared beneath the surface of the black liquid, it seemed that Zearth was about to die. Fortunately, Mydo and the children cheered for the hero, giving him the strength to force his way past his own fears. His love interest remembered Katsuto's words of how he felt stronger by hear her flute played with all her heart.
With his energy restored, Zearth erupted from the surface of the lake at full power, easily thrashing Cotton-Poppe while keeping Benzene at bay. He eventually knocked out Cotton-Poppe with the Zearth Knee Strike, then used the Super Zearth Kick to send Benzene flying into outer space. With Cotton-Poppe incapacitated, he took the monster into an orbit high above the Earth where he destroyed it safely using the Spachouchoura Beam. Meanwhile, Benzene drifted through space, with both his body and his pride hurt.
Not long after the defeat of Benzene and Cotton-Poppe, Benzene's wife, Lady-Benzene arrived to try her luck. Sending her underling Ultraman Shadow to attack the hero, he was ambushed in Antarctica, easily being pummeled and being given a bloodshot eye. Finally, he was struck by the Shadolium Beam, which due to his fear, overwhelmed his own, knocking him out. The battle left Zearth emotionally crushed and unable to fight due to complete terror of Shadow. But, after receiving a message from his father, as well as a capsule monster named Miraclon, Zearth decided to train and become powerful enough to face the evil android. But time wouldn't allow him to gain enough training before the evil Ultraman reappeared in the city.
As Zearth was still yet to overcome his fear of Shadow, the Ultra sent his capsule monster, the heroic Miraclon, to fight for him. However, while Miraclon defeated Shadow's capsule monster Darklar, Miraclon was pummeled by Shadow, forcing him to be recalled, allowing Shadow to capture the city for his mistress, including Katsuto's love interest. After a great deal of training, Katsuto regained confidence and transformed into Ultraman Zearth to battle his doppelganger. The two collided in an epic battle in Shadow City, Lady-Benzene's base. Zearth's training allowed him to overwhelm his nemesis, finally sending Shadow plummeting from the sky with his newly developed Ultra Heel Drop, damaging the robot's head, revealing the circuitry inside and seemingly defeating Shadow.
However, Lady-Benzene commanded Shadow to rise again, recharging him - the battle was not yet over! The two fired their finishing beams against each other, which locked. While Zearth appeared to have the upper hand, Lady-Benzene boosted Shadow's power, and the wicked machine began to overpower Zearth. With the voices of millions chanting behind him, Zearth managed to unlock even more of his strength, and switched to the mighty Cross Spachouchoura Beam. The attack easily cleaved through Shadow's beam, finally slamming into his body and blowing the robot apart. After the battle, Lady-Benzene appeared, congratulating Zearth for defeating Shadow but telling him it was far from over and she'd be back to conquer the Earth before she left in a shower of golden particles. Zearth restored the minds of all the enslaved humans, and sent them home before leaving himself, with newfound inner strength he would forever be the Earth's protector should the people of Benzene try to attack the planet again.
With the looming threat of The Kingdom becoming larger, Zearth, alongside Ultraman Nice and Ultraman Boy, trained at the Ultra Colosseum together. Nice and Zearth practiced fighting as a duo, but soon became annoyed with each other after Zearth messed up their routine. This argument quickly escalated to the two simultaneously punching each other in the face, before Ultrawoman Grigio arrived and broke up the fight. After she healed Nice and Zearth's injuries, the three Ultras introduced themselves to her. They then went over to the Monster Graveyard, where Boy had something rare to show them, which Grigio recognized as a Devil Splinter, making them panic. Gina Spectre then arrived and assaulted them, taking the Devil Splinter from them before Absolute Tartarus arrived with Alien Bat and Reibatos.
Bat then used his recreated Killer Plasma, taken from the data of Ultra Dark-Killer, to create Ultrawoman Grigio Darkness, who defeated the authentic Grigio in battle. However, Zearth, Nice and Boy help Grigio and encourage her to keep fighting, giving Grigio the determination to finish off her dark copy. The three of them then fight Reibatos until the New Generation Heroes arrive.
They shield Grigio when Gua Spectre reemerges in a new perfect form and attacks everyone, having been revived by forcing Mold and Juda's souls into Gina. After the New Generation Heroes defeated Gua, everyone returned to the Land of Light to continue training.
