Severn Altman, the great hero, was originally a star observer of M78 nebula 340. He came to the earth to make an orbit map and stayed on the earth to fight against big monsters and cosmic invaders. Among all Altman's works, Ultra Seven's production level is representative. In particular, stunt production and story content have made great innovations than before. Severn Altman's opponents are scary super beasts, intelligent astronauts, and fighting space robots, so Ultra Seven is flexible and good at intelligent tactics. In addition, another remarkable feature is that his body can change freely, such as fighting capsule monsters after miniaturization, which is also his characteristic. Ultra Seven, who left the earth, guarded Saturn. But then the twin monsters invaded the earth, and Ultra Seven returned to the earth to fight the monster. His right leg was injured in the battle. So the cluster lost its ability to deform. In order to make Ultraman Leo truly become a powerful warrior, the Star Group, which is already the captain of MAC, trained Leo in the devil. Then the disk creature attacked the MAC team. Except for Gen Ohtori, the MAC team was wiped out. At this point, the group let Gen Ohtori escape, and his life and death were unknown. Round Valley Company explained that the group did not die. (In Leo, the team exchanged Otto glasses for the monster planet, which proved that Yuangu Company had a plan to revive Severn. ) was taken back by King Otto and resurrected as Severn, which regained the power of Severn Altman and gave Ultraman Leo a dream. In his childhood, Yuangu Company filmed several sequels of Saiwen, the OVA version, and he later played Montubius Altman. However, in the 2009 super-galaxy monster war legend THEMOVIE, Saiwen had a son-Siro Altman, but Siro himself did not know, nor did his biological mother, but Siro later learned that he was Saiwen's son and helped them defeat the enemy.

At the end of the TV show, the whole team knew that he was Severn. When Montubius Altman visited in the 42nd episode of "Old Friends Come", we were surprised to find that UG's Wu Zhong Zhang actually became the supreme speaker of the guys! Which means he got promoted faster than the Rockets. Five years ago, before the twin Kiiras (Leo Altman's twin monster in the first episode) attacked Kuroshio Island, he was at least a theater commander, so it was not difficult to accommodate Severn Altman, the savior of the earth.