Two young college students die while scaling a Misty Mountain, a legendary summit where monsters are said to dwell. Meanwhile, Goh and Ueno are out on patrol and Goh feels the presence of a creature nearby. Back at headquarters, none of the other MAT members believe him, but Captain Kato thinks there might be something to the legend. Without informing his team, Kato sets out on foot to find evidence. He finds it in the form of a gigantic monster, and ends up trapped in a cave. Having seemingly disappeared, and with no one knowing of his whereabouts, Goh heads for Misty Mountain to find the Captain. Minami and Goh goes with the MAT Gyro but Goh uses the parachute to get down disobeying minami. When Goh gets down there he takes a sleep. The next day Goh sets out to look for Captain Kato. Goh finds Kato then the monsters Detton and Sadola show up! Kato escapes promising Goh that he would find help. Goh becomes Ultraman and fights off the monster. The two monsters were mighty for Ultraman he was so close to death. Then he used the Specium ray on Detton and uses the Ultra slash to kill Sadora. In the end MAT went to look for Goh but they found both him and Kato.
郷は霧吹山上空のパトロール中に怪獣の咆哮を耳にするが、それは郷の超感覚によって聴こえた音であったため、ＭＡＴアローに同乗していた上野隊員には聴こえていなかった。郷と上野の意見の対立を見かねた加藤隊長は真偽を確かめるため単身で霧吹山へと向かったが、そこに怪獣サドラが出現しピンチに陥ってしまう。
