Ultra Q is the series that came before Ultraman and in order to tie both series together, they had two monsters from Ultra Q appear in Ultraman.
In Ultraman, Ragon was originally a human sized beast, until an atomic bomb accidentilly went off in the ocean and caused it to grow huge (30 meters tall). Ragon found another atomic bomb and destroyed a ship and attacked a seaside hotel. The monster than pursued Fuji, Hoshino and a young girl into a nearby forest, where the Science Patrol tried to stop the beast from a jet, but failed. Hayata became Ultraman and battled Ragon, the battle was hard because he had to keep the atomic bomb from going off. Eventually Ultraman shot his Specium Ray in the creature, killing it, and the dead Ragon fell off of a cliff.
Kemular is an alien monster related to Zetton aliens. Dozens of birds are found dead and Kemular soon emerges and attacks a few girls picnicking. The Science Patrol researches a cloud of smoke and the rest of the team arrive as back up when communications end. After blasting the kaiju with their weapons, Kemular again uses his smoke causing the team to retreat. Kemular makes his way to Fuji's down rocket. Before it can crush the vehicle, the team gives Isamu directions through the radio on how to take off and escape. Kemular advances to one of Japan's cities as Arashi works on a counter for the poisonous smoke. Kemular easily destroys tanks and escapes. Hayata's plane is blown from the sky and as he falls, Hayata transforms into Ultraman. Kemular held the hero off with his smoke and the specium ray fails to destroy the creature. As Ultraman battled the creature, he held it up which allowed the patrol to hit his weak spot with a new weapon. Kemular falls down and manages to crawl back into his underground home, never to be seen again.
In Ultraman: The Ultimate Hero, after a hiker was found covered in a toxic substance, WINR was sent out to investigate the situation. The area was searched thoroughly with no sign of anything unusual other than strange substances on a few trees. The next day, a large amount of cattle disappeared without any evidence of escape or cattle rustling. Just then, a strange pair of wings came up from under the ground with a two pronged tail next to it. After it was analyzed back at the base, the body parts identified the monster as Kemular, a creature that wreaked havoc on China seventeen years earlier. After WINR fired at the tail, Kemular reacted using his sulfuric mist, causing their fighter to crash and poisoning the pilots. Later that day, WINR was given orders to destroy Kemular at all costs, allowing them access to a special aircraft called the MTC. Using meat to lure him to the surface, Kemular made himself known and used his long tongue to grab the bait, causing the MTC to shake violently. As WINR tried to fight Kemular, Kenichi took the meat and used the car to drag it with it. Kemular caught the smell of the meat and started to track Kenichi as WINR continued their assault on him. Once Kemular ate the meat, Kenichi's jeep crashed and shortly after turned into Ultraman Powered. Before Kemular was about to attack more hikers, Powered attacked him and began to do battle. Powered then held back Kemular's wings, allowing WINR to fire a missile at his brain and kill him.