and being tossed to nearby warehouses. : A monster with the ability to exhale . Arstron appeared in the vicinity of Mount Asagiri and terrorized its villagers, becoming Jack's first opponent prior to its destruction by the latter's Specium Ray. : Resided in the vicinity of Mt. Kirifuki, Sadola exploited the intense fog surrounding the mountain to prey on climbers and is armed with a pair of steel-cutting pincers. Go was the only one to sense the monster's presence due to his enhanced sense of hearing but his warnings fell on deaf ears since none of the MAT members were able to sense the monster. In order to clarify Go's warnings, Captain Kato went on a hike and was targeted by Sadola. The next day, Sadola joined forces with Detton in fighting against Jack but the alliance faltered when a fleeing Detton was killed, leaving Sadola decapitated with Jack's Ultra Slash. : A day after Captain Kato hid himself from Sadola, Go went to his aid but Detton surfaced and briefly fought against Sadola. The two monsters put their differences aside in fighting Ultraman Jack, but as Detton was about to escape, Jack intercepted it with Specium Ray. Due to its appearance, Detton was said to be the younger sibling of Telesdon from Ultraman, down to the point of sharing its flame exhaling ability. : A quadrupedal monster that eats uranium, hence its first attack on a power station. After his MAT Arrow 2 was taken down, Go transforms into Jack but Kingsaurs III's barrier prevented the Ultra from even hurting it and was forcefully reverted to Go upon defeat. Days later, Kingsaurs III targeted another power station but Jack managed to perform Meteor Kick by jumping over its barrier, thanks to Go's constant training. The fleeing monster was quickly killed by a Specium Ray shot. : An ancient monster from the Mesozoic era that preys on Twin Tail. In addition to its impervious rhinoceros-like skin, Gudon's main weapon is a pair of whip arms. It was first awakened from a quarry in Okutama but escaped MAT's attack due to Go's part in sensing a nearby civilian, sending him to a 3-day house arrest. Targeting the recently hatched Twin Tail, both whip monsters defeated Jack and left to fight outside the city. After Twin Tail was blinded by MAT, Gudon took the opportunity to kill its prey and was instantly