and a large fang on its mouth. After he crash landed on the island, Minami helped a trio of researchers to locate through the Monster Sonar he was delivering and detonated the cave where said monster was sleeping in. Unfortunately their actions only awaken Dunger into attacking them until Go raced to the island to deliver a cure for Minami's tetanus. He transformed into Ultraman Jack to deal with and kill Dunger with Specium Ray once the mane had been removed. : A fossil of a herbivore dinosaur discovered by elementary students, it was named Stegon due to its resemblance to a stegosaurus. Assumed by many to be deceased, the dinosaur is actually alive in an asphyxiated state and was awakened from the explosions at the excavation site. Gastric juices leaked from its stomach killed a few of the construction workers and it exhale acidic solvent. After terrorizing the same construction site at night, Stegon resurfaced the next day and confronted the MAT members. Under the children's wish to spare the monster, Jack froze Stegon with Stop Ray and brought it to outer space where it turned into a star and remain in hibernation for the rest of its life. : An underground monster from Nishinozawa with the ability to unleash from its back. After eating the , a buried weapon that was made by the Japanese Army, Mognezun is able to weaponize it to kill an entire filming crew and a few lodgers at four days later due to its sensitivity with noises. With Kishida hospitalized, the rest of MAT members deal with the monster. Go was forced to transform into Jack when the poison gas started to affect him. Once MAT dropped a pair of flammable gas tanks, Jack set the flame around Mognezun and reversed the tide of the battle. It was killed not long after from the Ultra Spin Kick delivered onto its head. : A monster living in Mt. Shirakami nearby the bypass area. It has the ability to exhale heat ray from its mouth and hated sulfur, hence its aversion for the quarry where MAT's training took place. Originally quiet and docile, the monster can be provoked by extreme noises from cars and motorcycle, hence it attacked a trio of bikers when they harass the late Ushiyama's daughter Shizuka. Due to reports from the monsters attacks (both on the bikers and destroying the bypass),