Petero (ペテロUltraseven. He appeared in episode 35. A strange rock-like monster composed of 80% water, Petero was the servant of the Zammpa aliens, and put up a difficult fight against Seven until by chance, a crashing meteorite gave Seven the light energy he needed to overpower and defeat his adversary.) was a monster that appeared in the TV series
Subtitle: Moon Monster (月怪獣 Tsuki Kaijū)
After Alien Zamppa failed to kill TDF member Kurata and Kiriyama, he sent Petero to do the job after his death. The monster tried to destroy their ships but forunately Dan transformed into Ultraseven and fight him. Petero was able to overpower Ultraseven thanks to the low temperature of the moon and the Ultra was cut from the sun until a meteorite crashed, emitting an explosion which Ultraseven used it to charge himself and finally kill the monster with Wide Shot.
- Petero's body is 80% water, 20% more than humans.
- Suit actor: Kunio Suzuki
- Petero is one of the monster that makes up Belyudra's Left Arm in Mega Monster Battle: Ultra Galaxy Legends The Movie.
- Petero's name was inspired by Saint Peter, one of the Twelve Apostles of Jesus Christ, leaders of the early Christian Church. Similarly, Eiji Tsuburaya, the founder of the Ultraman Series was a convert to Roman Catholicism.
- In the TNT dub, Petero is referred to as a Zamppa Bomb-Trotter.
- Height: 63 m
- Weight: 75,000 t
- Origin: Moon desert
- Powers and Weapons
- Adaption: Petero can survive in airless environments like the moon as well as very low temperatures. Through these adaptations, Petero is able to generate the water and oxygen required for his techniques to work.
- Eye Blasts: Petero can emit red energy blasts from his eye that are presumably filled with oxygen, allowing them to cause explosions in airless environments such as the moon.
- High Pressure Water Hose: From next to his eye, Petero can fire a powerful jet of high pressure water, capable of forcing opponents back. Given that his body is 80% water, he can use this ability for long periods of time without it harming him in any way.