Arstron

Arstron (アーストロン Āsutoron?), or Earthron, is a kaiju that first appeared in the TV series, Return of Ultraman.

Appearance
Arstron is a 60-meter-tall violent Kaiju that is mainly green in colour (or maybe brown), has yellow, orange, and light swamp green eyes with black pupils, has rock-like plates along its back, and has a straight long hook-like horn.

Episode 17: Dangers of the Desert
During a meteor investigation mission deep in a desert region, Antlar sprouted up his antlion-like hole and walked around to see if any intruder was near by attacking his area. An Arstron sprouted up out of the desert grounds and attacks the Antlar in the area. Titan, at home, managed to pick up their vibrations and flew back to the desert, seeing that Arstron and Antlar were fighting. Titan then swooped down and fought the two. It seems Antlar has won as it hits Arstron by reflecting his Magma Energy Beam and finishing him with a Magnetic Beam, causing Arstron to collapse. Titan and Antlar then continue fighting and Antlar wins to Titan too. But Arstron and Titan fein their defeats, ambushing Antlar by Arstron tearing off his mandibles and killing it with his Magma Energy Beam. Titan then melted Antlar‘s hide with his poisonous flamethrower. Shortly after their victory, Titan flew back home and Arstron invaded Antlar’s area, taking his hole. But, another two Antlar appeared and Arstron did the same thing as he did last time, fein his death, rip off their mandibles, and finish them with a Magma Energy Beam. He then went inside the antlion-like hole.