The first monster Ultraman faced against, the devilish Bemular escaped from being escorted to the Monster Graveword. He fled to rest in a lake in Japan. The next day, Bemular avoided the attacks of the Science Patrol until decided to dish out his blue breath ray. He grabbed Hayata's sub with his mouth and walked out of the lake, the Science Patrol's missilies disloding the sub from his mouth. He shoots his energy ray at the sub, but Hayata transforms into Ultraman. The pair grapple and wrestle around the lake, Bemular barely has an upper hand on the hero. After being thrown into the lake, Bemular tries to escape in his comet form but Ultraman's Spectrum Ray puts an end to him.He isn't see again until Mega Monster Battle: Ultra Galaxy Legends The Movie, where he is pursued and destroyed by Ultraman Mebius.
What Could Have Been: The name Bemular was one of the preceding concepts that eventually led to Ultraman. The hero was a bird monster but it was worried the audience would't be able to tell the difference between the good monsters and bad ones. So the monster design was later sold to Nikkatsu, which used it to create the Gappas.
The Baltan race are the first in a long line of Aliens that tried to take over the earth. The Baltans are also the first major recurring monster/alien of the series.
Accidentally awakened by young Hoshino, Neronga broke out of the ground and feeded on a nearby power plant. The Science Patrol attacked him when he was feeding on a transmission plant, but Neronga shocked one of their members and turned invisible, escaping. Neronga met the might of the military at his next target, and it was thought he was destroyed. But he returned and reigned damage upon the plant. Hoshino used a laser gun to blind Neronga in one eye. Ultraman made his appearance. Neronga was a bulldog, but he only somewhat holds on. When Neronga's horn is snapped off, it was all over. Ultraman tossed him into the air, and ended his life with the Spectrum Ray.Forty years alter, he reappears in the third episode of Ultra Galaxy Mega Monster Battle. Fighting and killing Gudon, Neronga preys on ZAP SPACY for electricity, and Gomora was summoned. Neronga wasn't a match against Gomora until he used his invisibility power against him. But Gomora managed to outwit him, and send him packing. Sometime later, Neronga was revived along with Telesdon and Red King. He was the first to charge against ZAP SPACY, but was killed in the crossfire by Telesdon.
In his first appearance, Red King was one of the many monster that inhabited Tatara Island and had fought with many of the monster inhabitants and had terrorized a group of Scientists who were studying on the Island as well. After tearing off a Chandler's wings and having killed Pigmon, Red King was soon met with his comeuppance when Ultraman arrived to avenge Pigmon. About half way through the series, a second Red King appeared and had fought with Dorako and Gigass after being awakened by a passing comet. Red King kills Dorako and frightens Gigass away before setting his sights on the Science Patrol. Like before however, he is met with by Ultraman, who kills the second monster by chopping him into thirds.Red King has appeared in at least twelve different Ultra Series, making him one of the most popular monsters in the entire Ultra series.
Then his costume was reused and paint a dirty yellowish brown for his reappearance as Red King II. Although he did have a different head in order to make it look like he ate a dangerous bomb and had it lodged in his throat.
Finally, his arms were used for the final monster, Zetton.
What Could Have Been: Back when Ultraman's original concept was to be known as "Redman", Red King was to be the king of the monsters of the show. Red King however kept his name for unknown reasons when the show turned to Ultraman.
Wrestler in All of Us: Red King's fighting style literally looks like something out of WWE. Mind you he came in the late 1960s.
Alien Zarab / Imitation Ultraman
Gomora was a powerful and rare monster that was living in solitude in the Johnson Islands, being studied by Scientists. Believing that it would be a good idea to bring a living monster to be displayed at a World's Fair. The Science Patrol capture and tranquilize Gomora and prepare to have him air-lifted to said fair. Gomora however wakes up in mid-flight and goes on an unstoppable rampage from being attacked. Ultraman eventually shows up and tries to stop the monster, but is shocking unsuccessful after being bludgeoned by Gomora's tail over and over until Gomora escapes. Gomora continues his rampage, making his way through Osaka with nothing being able to stop him. Finally after having his tail blown off, being assaulted by Japan's own SDF, and facing Ultraman in a rematch, Gomora was finally put down.Gomora has appeared in at least eight different Ultra Series, and was even the star of 2 of his own TV series'. making him one of the most popular monsters in the entire Ultra series.
Badass Normal: In his original series, he was the first monster to defeat Ultraman AND was the ONLY monster with a 2-part episode, despite having nothing to show off but his brute strength and burrowing.
The Juggernaut: Is definitely this in his first appearance. Being able to defeat Ultraman with relative ease, having his tail severed off by the Science Patrol, getting the crap beat out of him by the SDF and Ultraman.
Tail Slap: Gomora likes to use his tail in combat A LOT. His tail is how he managed to subdue Ultraman in their first battle.
There Is No Kill Like Overkill: In the Ultra Galaxy series, after being the crap out of his opponent, Gomora usually finishes them off by impaling them with his horn and then destroying their innards with his Oscillatory Ray, which completely obliterating them.
Took a Level in Badass: As seen in the Ultra Galaxy series. Especially in comparison to his previous role beforehand.
Tunnel King: His primary weapon before his received his Oscillatory Ray was Burrowing.
Unstoppable Rage: Does this really need to be stated after it already has multiple times?
His general personality when he's in Reionic Burst Mode, which comes as no surprise since Rei is also in this mode as well.
The proclaimed Monster Chief. Geronimon had resurrected Telesdon, Dorako, and Pigmon as a warning to both Earth and Ultraman of his powers and his anger for the death of all his monsters, and thus had declared war on humanity in doing so. After his messengers were killed by the Science Patrol (minus Pigmon who was killed by Dorako). Geronimon appeared to take care of the situation himself. After battling against Ultraman with the use of his feathers, he too was killed by the Science Patrol.
Feather Flechettes: Can fling these out from the tip of his tail, but they are limited in numbers.
Glass Cannon: Despite all of the abilities he has (as well as the ones stated that he has), not only did Ultraman subdue him with ease (AFTER he took out Geronimon's Feather Flechettes) but he's also one of the few monsters in the series to be killed NOT by Ultraman, but by the Science Patrol.