|Home world:||Planet Earth (Various Universes)|
|First Appearance:||Return of Ultraman episode 1 "All Monsters Attack"|
|Latest Appearance:||Ultraman Geed episode 5 "Partners"|
|Affiliation:||Ghostron (possible relative)|
Ultraman Belial (Master)
Arstron (アーストロン Āsutoron), or Earthron, is a kaiju that first appeared in the TV series, Return of Ultraman, in episode 1. A ferocious, reptilian monster with a cranial horn atop its head, Arstron made itself known when it appeared mysteriously on a mountainous zone and unleashed his wrath on a nearby village. He was eventually confronted and slain by Ultraman Jack, but other members of his species would rise in later years.
Subtitle: Violent Monster (凶暴怪獣 Kyōbō Kaijū)
Return of Ultraman
Arstron first appeared mysteriously in a mountainous region without warning or origin, attacking a nearby village and setting fire to the homes with his Magma Ray. MAT arrived shortly after the monster arose, attacking the beast with their cannon fire but to no avail. Arstron continued destroying the village. Hideki Goh, the host of the newest Ultraman came to the scene, guided by Ultraman Jack's conscience came to the village to help some people who were trapped in the debris caused by Arstron's rampage, before unknowingly transforming into the new Ultraman Jack by sheer willpower. Jack quickly turned to face Arstron and the two fought, taking their battle from the ruined village to a nearby valley (presumably the same one Arstron emerged from). However, Jack's Color Timer was start to blink cause his strength to deplete and Arstron to gain an advantage, but Jack continued to fight back and eventually hit Arstron with a Specium Ray, causing Arstron to tumble back into a crater and explode into blue flames.
- Arstron's roar is a modified roar of the Daiei monster, Gyaos, and some of his screams might be modified pig squeaks.
- Arstron resembles Godzilla in design. This is possibly due to that fact that Arstron was designed by Nobuyuki, an art director who worked at Toho Co. Ltd and designed some of the Godzilla suits and in default, Gomess.
- Arstron has a possible relative: Ghostron.
- Arstron appears in the opening to the series, Ultraman Ace, as one of the many silhouettes of monsters.
- Originally, Jack was to lose to Arstron, leading Hideki to train before they fought again, leading to Jack's success.
- Several elements reminiscent of Gomess were added to the suit in the first prototype, these were later removed before filming, but some photos of this version of the suit were released in magazines and even a vinyl figure.
- Arstron reappears in a Televi-kun Magazine that features Ultraman X, where he is used to demonstrate the Ultra's power by being the victim of Xanadium Ray.
- Arstron's Spark Doll can be seen in the second Ultraman Ginga: Theater Special.
- This episode was later featured in episode 30 of Ultraman Retsuden, "All Monsters Attack! Birth of Jack!!".
Arstron reappeared in episode 27 of The☆Ultraman.
The first monster in the Babaloneon Empire, Arstron emerged from the ground and almost engaged Ghostron in battle. As the Science Garrison watched on in awe, yet another beast, Gokinezula, joined the three in a titanic three-way battle royal. As the three monsters were locked in mortal combat, Aboras and Banila emerged as well and battled elsewhere on the island. With five monsters running wild, the Science Garrison began to blanket the entire island with bombs in hopes of killing them all off, however the Babaloneon Empire fought back as well, downing their jet in between Arstron and Ghostron. Arstron was quick to respond to the Science Garrison's presence and quickly destroyed what remained of their ship. The Science Garrison however was not without its own defenses and was able to destroy Arstron after firing at rocket at the monster.
- Like the majority of returning monsters in the series, Arstron does not possess his original roar.
In this series, Arstron's origin is again not stated, and his attack comes out of the blue like before, attacking GUYS's HQ at a test site. However this time his actions are being guided by a Cherubim, who is using diverted frequency waves (originally intended to control Marquette Monsters) and directing them at Arstron to control him (in a rather comical way). Ultraman Mebius arrives to do battle against Arstron and has the upper hand until Cherubim arrives and the two monsters double-team him. Team GUYS learns of Cherubim's control over Arstron and destroys the frequency waves that are doing so, severing Cherubim's control. Once freed, Arstron attacks Cherubim when provoked by the alien monster, but both monsters are destroyed by Ultraman Mebius, who uses his Mebium Blade to cut Arstron's head off.
Ultra Galaxy Mega Monster Battle
Arstron reappeared in episode 8 of the series Ultra Galaxy Mega Monster Battle.
In this series, Arstron appears again out of nowhere and attacks a Cherubim in the area (possibly reminiscing their relationship in the previous series). It seems Cherubim has won as it hits Arstron with several fireballs causing Arstron to collapse, but Arstron feins his defeat, ambushing the other kaiju by tearing off his "ears" and killing it with his Magma Energy Beam. Shortly after his victory, Arstron is dragged underwater where he is forced to do battle against an Eleking, where he was not so lucky, being electrocuted to death by Eleking's tail.
- Arstron appears again in the flashback of a little girl who witnesses him in battle against a Red King.
- The Arstron suit from Ultraman Mebius was reused for Arstron's appearance in the series.
- During the opening credits to the series, Arstron is seen battling Bemstar, even though neither monster fought or met each other in the series.
- Arston's battles against Cherubim and Eleking were referenced by the Spark Dolls Troupe in New Ultraman Retsuden episode 16.
Ultra Galaxy Mega Monster Battle: Never Ending Odyssey
Arstron returned in episode 3 of the sequel series Ultra Galaxy Mega Monster Battle: Never Ending Odyssey.
- The Arstron suit from Ultraman Mebius was reused for Arstron's appearance in the series.
- During the opening credits to the series, Arstron is seen battling Gomess, even though neither monster fought or met each other in the series. Ironically, both monsters are affiliated to Godzilla.
Mega Monster Battle: Ultra Galaxy Legends The Movie
Arstron reappeared in the movie Mega Monster Battle: Ultra Galaxy Legends The Movie as one of Ultraman Belial's 100 Monster Army. He was first seen reacting to the Plasma Spark as a spirit along with Roberuga II, Fire Golza, King Pandon, Alien Metron, and Gudon in a shot of the Monster Graveyard. He teamed up with Zoa Muruchi, Telesdon, Alien Temperor, and Alien Hipporito to take on Gomora. When Reimon and Gomora went berserk due to Belial's actions, Arston was called back along with the other surving monsters to watch Gomora take on the Ultras. When Ultraman Zero arrived, Arston teamed up with the rest of the remaining monsters to take Zero down. He was the first monster to be killed by Ultraman Zero's Zero Sluggers followed by King Pandon, Verokron, Sadola, and Alien Hipporito.
- The Arstron suit from Ultraman Mebius was reused for Arstron's appearance in the film.
- Arstron is one of the monsters that makes up Beryudora's left arm
Arstron reappeared in the movie Ultraman Saga.
Arstron appears in an alternate universe of Earth in Tokyo where it attacks Team U during their raid on an abandoned store for groceries. Despite Team U's efforts with their U Loaders, Arstron shrugs off their assaults and continues on his rampage. Shortly after Team U is beaten, Ultraman Dyna appears and quickly destroys Arstron, hurling him into the air (by spinning him around by his tail) and destroying him with the Solgent Ray.
- The Arstron suit from Ultraman Mebius was reused for Arstron's appearance in the film with a new head constructed.
- In this film, Arstron's Magma Ray attack is stylized more as a short blast of lava fired from his mouth, rather than an actual beam.
- According to several earlier released trailers of the film, Ultraman Dyna and Arstron's fight was to last longer (scenes in while Dyna is seen punching and kneeling Arstron in the face are present within these trailers), but were later cut from the film for unknown reasons.
- Arstron's death is very similar to that of Zetton II from the final episode of Return of Ultraman, the same episode that Alien Bat first appeared in.
- Originally, Gabora was meant to be the kaiju in Arstron's position in the film but was later switched to latter.
Arstron returns in the episode 1 of this web series as Kugutsu Arstron (クグツアーストロン Kugutsu Āsutoron).
In this series, Arstron is one of the victims of the Bezelbs. When Shinra visited Psychi, the doctor showed the power of the Kugutsu. Arstron was on Planet Zain next to King Guesra and both were infected with Kugutsu. Soon they receive the order to fight and the winner was Arstron when beating to the ground to Guesra, causing the death to him. The infected Arstron increases its power with Queen Bezelb.
During the final battle, Arstron, along with Vakishim and two Bezelbs, teamed up with Psyqueen to destroy the tree. However, Orb, Dyna, Gaia, Agul, and Cosmos appeared to try and stop them. While Orb tried helping an infected Amate, Gaia and Agul battled Psyqueen, Cosmos fought Vakishim, and Dyna fought Arstron. In the end, Arstron, along with Amate and Vakishim, were cured when Cosmos fed them the petals of the Tree of Life, and the kaiju and choju were sent somewhere far from civilization to live in peace.
- The Arstron suit from Ultraman Saga was reused for Arstron's appearance in the series. However, the suit was given red veins after the Bezelb stung it.
- Arstron appearing during the night marks a similarity to its debut episode, where it attacked a village at night.
- His battle with Dyna pays tribute to the beginning scene in Ultraman Saga, where Dyna fought a revived Arstron. However, this was the first time both Ultra and Kaiju psychically fought each other, while the original scenes in the movie were cut.
- This marks the first time Arstron doesn't die.
Arstron reappeared in episode 5 of Ultraman Geed where he emerged from underground and appeared in a city and went searching for a Little Star, which just so happened to be hosted by Moko, who was in a pet carrier being carried by Moa Aizaki. Before Arstron could crush Moa, Riku came rushing over to save her and transformed into Ultraman Geed and knocked the monster away with a flying kick.
As their fight began, Arstron struck at Geed with his tail only for the latter to dodge it in time. The Ultra then held him by the head and delivered a few sharp blows to him until Arstron figured out the Little Star's location and left, even going as far as to swat the Ultra away effortlessly. But still, Geed prevented the monster from obtaining it and kept up the fight. After kicking him away, Geed attempted to blow up Arstron with his Wrecking Burst, but Pega stopped him as RE.M. told Geed that they were close to some explosive tanks that would explode if he destroyed Arstron there.
With Geed in a bind, the kaiju took the advantage and attacked the Ultra with a Magma Beam. Afterwards, Moko gave up his Little Star, which took the form of the Ultra Capsule of Ultraman Cosmos and with that, plus the Ultra Capsule of Ultraman Hikari, Geed transformed into his new form, Acro Smasher. Afterwards, he used his Atmos Impact technique to push Arstron away from the tanks, preventing a city-wide explosion. He then jumped over him and taunted him to come closer and when Arstron charged at him, Geed slashed at the kaiju's horn with his Smash Beam Blade, dodged his Magma Beam, and finally used his Smash Moon Healing to calm the kaiju. No longer wanting to fight, Arstron dug back underground in peace.
- Suit Actor: Kazunari Yokoo
- The Arstron suit from Ultraman Saga was reused for Arstron's appearance in the series.
- This is the second time where Arstron doesn't get killed. The first one being in Ultraman Orb THE ORIGIN SAGA.
- Height: 60 m
- Weight: 25,000 t
- Origin: A Morning fog (Return of Ultraman, and both Ultra Galaxy series), near GUYS vs. Kaiju Institute Vicinity (Mebius), Planet Boris (Ultra Galaxy), Monster Graveyard (Saga)
- Attack: 1000 (Galaxy), 900 (NEO)
- Defense: 1100 (Galaxy), 1000 (NEO)
- Speed: 600 (Galaxy), 15 (NEO)
- Powers and Weapons
- Cranial Horn: Arstron can use its cranial horn to stab the enemy.
- Magma Ray (マグマ光線 Maguma Kōsen): From his maw, Arstron can fire a very powerful beam of magma energy, that is as hot as magma. This beam can be charged up for an even stronger shot that has enough firepower to be capable of completely destroying weaker adversarial monsters in one hit.
- Fireballs: Astron is able to spit fireballs from its mouth.
- Thick Hide: Astron has an extremely thick hide, making it hard to damage him internally and externally.
- Burrowing: Arstron can burrow at moderate speeds.
- Height: 60 m
- Weight: 25,000 t
- Origin: Unknown, possibly Planet Zain
- Powers and Weapons
- Cranial Horn: Kugutsu Arstron's main weapon is its cranial horn, which can be used to stab the enemy.
- Super Strength: Kugutsu Arstron is capable of throwing its opponents with great strength, doing so to defeat King Guesra by simply throwing it off.
- Bezelb Empowerment: According to Psychi, if a living being infected with a Kugutsu won a fight, the Kugutsu's concentration on their body increases. This as well cause the Queen Bezelb and the Bezelb that had Arstron infected grew in strength.
- Anti-Gravity Flight: Possibly as a result from the Kugutsu's influence, Arstron displays the ability to fly by itself.
- Height: 60 m
- Weight: 25,000 t
- Origin: Babaloneon Empire
- Powers and Weapons
- Energy Blasts: Joneus Astron can launch missile-strength blasts of magma energy from its mouth.
- Burrowing: Joneus Arstron can burrow at moderate speeds.
- Height: TBA
- Weight: TBA
- Origin: TBA
Arstron reappeared in the series, Redman.
Arstron first appeared in episode 3 where he appears on a hill and kicks a fallen tree to trip Redman but he jumps over it. Arstron tries to get away, but Redman chased him up the hill to a large field to fight. After a bit of battling, Redman threw the Red Knife, killing Arstron in a small explosion.
In episode 4, Arstron was tricked by Redman's teleportation and was killed with his Red Chop.
Arston reappears in episode 52 where he fights Redman right from the start. They kept the fight evenly matched against each other but eventually the hero kills the monster by jumping to the top of a mountain, where they started their fight, and landing a Red Kick to the face.
In episode 55, Arston fights Redman alone right from the start where they roll down a hill and have a go at grappling techniques at each other but Artson eventually lost to a final judo throw to the ground. Soon after that, Alien Mysteler would appear to fight him, but would eventually lose.
Arstron's final appearance in Redman was in episode 56, where he, along with Alien Mysteler, teamed up once again, this time with Sartan, to take down Redman. Even though they had the team advantage, Redman still didn't lose hope, and eventually, Arstron was killed with a Red Knife to the torso, with Sartan and Mysteler following afterwards.
- Unlike the majority of monsters in the series, Arstron's suit was not re-used from the Return of Ultraman series. Instead, it was reused from the Arstron suit that was used during stage shows and attractions.
- In this series, Arstron has a reused roar of the Toho monster Godzilla.
Astron appears in the first issue of the Redman comic, scaring a local herd of Redmon and fighting the titular hero.
- Given Matt Frank's redesign, the Astron in the comic has a more pear shape, with larger hips and a smaller upper body.
|Return of Ultraman Kaiju & Seijin|
|Takkong | Zazahn | Arstron | Sadola | Detton | Kingsaurus III | Gudon | Twin Tail | Gorbagos | Ghostron | Dangar | Stegon | Mognezun | Shugaron | Seamons | Seagorath | Eledortus | Terochilus | Bemstar | Sartan | Magnedon | Beacon | Gokinezula | Zanika | Vacuumon | Kupukupu | Kingstron | Zagoras | Nokogilin | Gronken | Varricane | Yadokarin | Oxter | Plooma | Alien Zelan | King Maimai | Alien Mates | Muruchi | Leogon | Pris-Ma | Draculas | Re-Seagorath | Re-Bemstar | Black King | Alien Nackle | Alien Varduck | Alien Black | Snowgon | Alien Baltan. Jr | Builgamo | Alien Stora | Paragon | Alien Grotes | Kodaigon | Granadas | Alien Centaurus | Robonez | Alien Cygnus-61 | Alien Messie | Alien Zoole | Red Killer | Femigon | Yametaranese | Sasahiller | Alien Ateria | Alien Mysteler | King Bockle | Alien Bat | Zetton II|
|Redman Kaiju & Seijin|
|Redman||Darkron | Black King | Arstron | Garamon | Alien Icarus | Dorako | Peguila | Jirass | Alien Baltan | Alien Goron | Gomora | Woo | Kanegon | Alien Mefilas | Sadola | Dangar | Ghostron | Gokinezula | Eleking | Telesdon | Nokogilin | King Maimai | Sartan | Bemstar | Beacon | Gronken | Zaurs | Kingstron | Stegon | Alien Mysteler | Zagoras | Kodaigon | Granadas | Plooma | Sasahiller | Alien Centaurus | Gudon | Red Killer | Draculas | Shugaron | Alien Bat | Zetton II|
|Unused Redman Kaiju & Seijin||Big Liger | Graygas | Sufinga|
|The☆Ultraman Kaiju & Seijin|
|Pigu | Seagra | Spiral | Wanigodon | Red Smogy | Tough Gillan | Tough Gillas | Tough Gillaco | Firebadon | Combugon | Robot No.101 | Alien Baltan IV | Mikonos | Dolfiego | Xalome | Hectore | Liquid Monster | Opt | Garadoras | Xyclon | Gellon | Gadon | Goglan | King Moa | Badan | Islanda | Gerada | Janyur | Bedoran | Bader Group | Bagon | Janyur III | Zaanmoth | Zanba | Dragodos | Death Balan | Gibaaroga | Red King | Aboras | Banila | Earthtron | Ghostron | Gokinezula | Alien Baladon | Dabaran | Jadan | Jagon | Skeldon | Garbados | Megasaura | Babilar | Gamiba | Imedo Being | Goadarion | Jinario | Groteng | Plazoon | Agujon | Deathpower | Zuma | Gurol | Putgolia | Iddunus | Darantulas | Alien Noa | Heller | Roygar | Panther | Heller Army | Gumons | Hell Cat | Orolan | Gilos | Gilo | Fake Ultraman Joneus | Hatari | Large Battleship | Dostony | Spader | Caperadon | Alien Scien | Golding | Gedon | Hella Umaya | Heller Fleet | Makdatar|
|Ultraman Zero Kaiju & Seijin|
|Ultraman Zero The Movie: Super Deciding Fight! The Belial Galactic Empire||Alien Esmeralda Emerana Lourdes | Iaron | Darkgone | Legionoids | Delusts | Brigantes | Two-Dimensional People | Darklops | Malebrandes | Arch Belial|
|Ultraman Zero Gaiden: Killer the Beatstar||Beatstar | Rei's Gomora | Ace Killer | Inpelaizer | King Joe | Rei's Litra | Alien Bat|
|Ultraman Saga||Hyper Zetton | Alien Bat | Sphire | Gubila | Gomess (S) | Astron | Legionoids | Chaos Header 0 | Lidorias | Bolgils | Mogrudon | Golmede | Mienin | Eligal|
|Ultra Zero Fight||Bemular | Telesdon | Gudon | Sadola | Gurashie | Red King | Galberos | Gan Q | Bemstar | Pigmon | Surai | Villainous of the Villainy | Jathar of Hell | Deathrog | Glocken | Silvergon | Fanegeon People | Tyrant | Armored Darkness | Kaiser Darkness|
|Ultraman Taiga Kaiju & Seijin|
|Alien Rivers Kawazu | Alien Kukaratch | Cicada Human | Alien Magma | Baby Zandrias | Zegan | Young Mother Zandrias | Alien Markind | Hellberus | Baby Guesra Chibisuke | Rekyum Man | King Guesra Chibisuke | Galactron MK2 | Deavorick (MB) | Alien Fanton | Alien Zetton Zorin | Volk | Alien Serpent | Garmes Man | Hupnath | Alien Pedan | Alien Seger | Segmeger | Alien Damara | Alien Gapiya Abel | Cicada Girl | Alien Perolynga | Alien Babarue|