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"You're so good with that flute, Tohru. Whenever I hear you play it, it just fills me with strength!"

Katsuto Asahi (as Ultraman Zearth) to Tohru Hoshimi, Ultraman Zearth

Ultraman Zearth (ウルトラマンゼアス Urutoraman Zeasu) is an Ultra hailing from the Land of Bright in Nebula Z95 (a parody of the Land of Light in Nebula M78). 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.



"Zearth" comes from the words "zenith", which means "the highest point" or the "height" of an aspect of a given item, and "Earth".[1]


One of Zearth's most defining characteristics is his strong belief in maintaining cleanliness, which manifests as germophobia on occasion; Zearth will avoid dirt at all costs, to the point that he paused his training to clean his hand after he accidentally got it dirty while practicing his beam techniques. Zearth is also aware of his own limits, and though he is deeply concerned and afraid of fighting opponents stronger than him, he tries his best to continue to get stronger for the sake of the Earth.


Ultraman Zearth

Zearth training to properly use his Ultra Beam

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.

Zearth fighting Benzene and his monstrous servant

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.Ultraman Zearth

Ultraman Zearth 2: Superhuman Big Battle - Light and Shadow

Ultraman Zearth in Ultraman Zearth 2: Superhuman Big Battle - Light and Shadow

Zearth lies defeated after his first battle with Ultraman Shadow

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. Ultraman Zearth 2: Superhuman Big Battle - Light and Shadow

Ultra Galaxy Fight: The Destined Crossroad

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. Ultra Galaxy Fight: The Destined Crossroad


Ultraman Zearth full.png


  • Height: 60 m
  • Weight: 54,540 t
  • Age: 9,500 years old
  • Home World: Land of Bright (ピカリの国 Pikari no Kuni lit. Land of Sparkles), Nebula Z95 (Z95星雲 Zetto Kyūjū-go Seiun)
  • Maximum Flight Speed: Mach 19.9
  • Maximum Running Speed: Mach 5.55
  • Maximum Underwater Speed: 889 km/h
  • Maximum Underground Speed: Mach 1
  • Maximum Jumping Height: 1000 m
  • Arm Strength: 100,000 t
  • Grip Strength: 50,000 t
  • Weaknesses: Zearth originally had a fear of any substance considered 'filth' such as mud, oil etc. The fear was so great that attempting to walk across a pool of tar caused his Color Timer to go off and he nearly drowned before regaining his strength. He has since overcome this fear.


Zearth's transformation is the same in both movies. Katsuto Asahi brushes his teeth with his special toothbrush and raises it into the air, similar to how Hayata used the Beta Capsule. In the first movie, a typical rise was shown while in the second film, the rise scene was given a transformation effect in real-time, with Katsuto turning into Zearth in a tower of light and then flying off into the sky for his showdown with Shadow. Zearth's transformation item in the first films was the Pikari Brush, which was a white electric toothbrush that he kept in his top pocket. In the second film, the second Pikari Brush was red and yellow and resembled his body markings.



  • Spachouchoura Beam (スペシュッシュラ光線 Supeshusshura Kōsen): Also known as Speciu-shula Beam, this attack is Zearth's "+" style beam attack. It can destroy monsters in one shot, though when Zearth first used it, the beam was only about as accurate as Taro's when he was a boy.
    • Cross Spachouchoura Beam (クロス・スペシュッシュラ光線 Kurosu Supeshusshura Kōsen): The "X" style version of the Spachouchoura Beam. Can destroy monsters in one shot and is more powerful than his normal beam or Ultraman Shadow's Shadolium Beam at full power.


  • Super Zearth Kick (スーパーゼアスキック Sūpā Zeasu Kikku): A spinning kick with enough force to send an enemy flying into space.
  • Ultra Heel Drop (ウルトラかかと落とし Urutora Kakato Otoshi): An axe kick using a flame covered foot.
  • Zearth Machine Gun Kick (ゼアス・マシンガンキック Zeasu Mashin Gan Kikku): A flying kick attack.
  • Zearth Knee Kick (ゼアスニーキック Zeasu Nī Kikku): Zearth concentrates energy into his leg and disperses it into his enemy via a knee kick, leaving them paralyzed.
  • Zearth Drop Kick (ゼアス・ドロップキック Zeasu Doroppu Kikku): A drop kick from high above at maximum flight speed. Used to break Cottenpope's horn.
  • Zearth Punch (ゼアスパンチ Zeasu Panchi): A punching attack.
  • Zearshutoh (ゼアシュトー Zeashutō): A blow to the crown of the head.
  • Zearth KO Punch (ゼアスKOパンチ Zeasu Kē-Ō Panchi): A powerful punch aimed at the Solar Plexus.
  • Zearth Chop: A chop from high above down the middle of an object
  • Zearth Cross Ver. 1.0 (ゼアスクロスVer.1.0 Zeasu Kurosu Ver.1.0): A chop in the air while gliding by the opponent.
  • Zearth Counterblow (ゼアスカウンターブロー Zeasu Kauntāburō) (Unused): A horizontal chop.


  • Ultra Warp Beam (ウルトラワープビーム Urutora Wāpu Bīmu): Zearth teleports objects/people using beams of light from his eyes.
  • Zeascan (ゼアスキャン Zeaskyan) (Unused): Sterilizes the area within a 50 km radius.
  • Ultra Rewind (ウルトラリワンド Urutora Riwaindo) (Unused): Rewinds time.
  • Ultra Stretch (ウルトラストレッチ Urutora Sutoretchi) (Unused): Slows time.
  • Ultra Blender (ウルトラブレンダー Urutora Burendā) (Unused): Makes hyperspace temporarily. It is similar to Ultraman Nexus' Meta Field ability which was later demonstrated.
  • Z Capsule Light Monster Miraclon: A gift to Zearth from his father.


  • Zearth is:
    • The first Ultra to show his eyes being visibly damaged by an opponent, as shown when Shadow punched him in the face, his left eye turned red, the Ultra equivalent of a black-eye.
    • The first Ultra to demonstrate that their strength can be directly influenced by their emotional state, as his Color Timer began blinking rapidly (indicating that his energy levels were falling precipitously) when Alien Benzene exploited his fear of dirt by forcing him to cross a lake of tar to save his friends.
      • This concept would later be revisited and expanded upon in Ultraman Z, where it is shown that the emotions of an Ultra's host can have the same effect.
    • The first Ultra to use more than one transformation item (excluding willpower), as the Pikari Brusher was upgraded/replaced by the Pikari Brusher 2.
      • The replacement of the Pikari Brusher, may stem from the fact that in real life, toothbrushes need to be replaced after a certain number of usages.
    • The first Ultra to fire his signature beam from his left hand.
    • The first Ultra to open his mouth. During the final battle against Ultraman Shadow, Zearth lets out a battle cry before overpowering Shadow in their beam clash, ultimately destroying Shadow. The inside of his mouth was a blue light showing his inner tissues to be mostly or entirely made of energy. The second Ultra to open their mouth was Ultraman Belial. However, Belial is constantly seen with his mouth opening and closing while he speaks.
  • Despite being seen as the most cowardly of all Ultra Heroes, Zearth is surprisingly strong, defeating an alien and a monster at the same time with no help from a defense force. He can also rewind time, speed up time and slow time, something not many Ultras can do. Despite that, Zearth is also not the first Ultra to run from a fight, that would be Ultraman Jack, who retreated from Bemstar in an attempt to regain his energy, and later in the series refused to fight Zetton for fear of the monster. Zearth also only refused to fight because of his lack of confidence in his own abilities and not actual fear of his opponent like Jack.
  • Zearth's suit is made from the same type of material as Ultraman Great's and his Color Timer is also the first to use LEDs. His gloves are also the first sewn into the suit itself.
  • A third Zearth movie was proposed, but at that time Ultraman Tiga & Ultraman Dyna: Warriors of the Star of Light was being produced and it was scrapped.
    • The plot of the third movie would have made Zearth the grandson of his movies' universe's Ultraman King.
  • Zearth's father was shown before, but the only known image of him is a shadowy outline of an Ultra with Ultra Horns.

The Land of Bright

  • Zearth's home world, the Land of Bright, seems to be home to Ultra versions of animals like birds and cats.
  • In his first film's promotional video, Zearth is seen using the original Ultraman's grunt, but in the second promotional video, Zearth's entirely new grunt is used instead.


  1. Ultraman Zearth Super Complete Works 2 1997, p. 49
  2. https://twitter.com/TsuburayaGlobal/status/1385028075549716482

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