A giant hermit crab monster in search of a new shell, using MAT's Space Station No. 5 and landed on West Tokyo. Jiro was inside the station during his search for Yoshiko's parakeet, forcing Go to personally rescue the boy. After MAT Arrow unleashed its napalm missiles, Jack skewered Yadokarin with Ultra Lance and burn it with Specium Ray. : A giant armadillo-themed monster from Zeran's home world, its true purpose was to act as a bait for Jack to use his Ultra Bracelet, fulfilling its duty at the cost of its own life. Plooma is capable of firing a heat ray and using its poisonous fangs. : A space monster belonged to Alien Black who possessed while using the legend of Yuki-onna to kidnap newlywed couples. Snowgon froze Ultraman Jack and tore him into pieces, but the Ultra reforms with his bracelet and summons Ultra Defender to freeze Snowgon with her own power before he destroyed her with a throw. Misako is portrayed by . : Alien Stora's monster, which he uses to create mirage incidents from the top of Mount Fuji in an attempt to force mankind into surrendering Earth. Although initially appeared as a giant, Jack managed to expose the monster being several times smaller and dropped Paragon into Mount Fuji's volcano. : A monster under Alien Kentauros' control. It was sent to attack MAT's Radar Base in order to destroy Kishida's newly developed radar but a lone Kentauros named Akane destroyed the monster with herself after being captivated by mankind's kindness. : A robot monster from Messie Nebula, themed after an Earth mouse. It was the first of Alien Messie's servant to attack Earth and fought Ultraman Jack, using its infectious bite to weaken the Ultra. Robonezu was killed by Bracelet Bomb, where it was strapped to an entire mechanical frame. : The Zooles' monster, armed with a pair of and capable of exhaling white gas. After faking its defeat from MAT's weapon, Redkiller was ordered by Zoole to kill Go and Toru at a hospital. Using Bracelet Whip, Jack stole the Razor Boomerangs and use them against Redkiller in Ultra Cross Cutting attack. : A space monster whose true form is a wandering hitodama. It possessed Yuriko Oka at some point of time and caused her create accidents in her job, so much so that she was given a month-long vacation from duty. Femigon then