地球侵略を狙う異次元人ヤプールが、コンビナートに超獣ベロクロンを送り出した。ベロクロンの攻撃により街は破壊され、北斗星司と南夕子は命を落としてしまう。だが、そのとき、ウルトラの奇跡が起きる！
Impressed by the sacrifices of Seiji Hokuto and Yuko Minami by protecting the people during an attack of Verokron who was created by Dimension Man Yapool, the 5 Ultra Brothers gave the two humans lives, and send their new member Ultraman Ace to be their human host to fight off a age of new Monsters know as Choju.
