Yapool, an ancient interdimensional race of beings tries to conquer the Planet Earth with his army of monsters, called Terrible-Monsters. The newest member of the Ultra Brothers, Ultraman Ace, arrives on Earth to aid humanity in the battle against Yapool. Touched by the sacrifices of Seiji Hokuto and Yuko Minami, he revives them and grants them the Ultra Rings, which allows them to transform into Ultraman Ace in times of need.
Keiji Takamine
Seiji Hokuto
Gorō Naya
Ultraman Ace (voice)
Mitsuko Hoshi
Yuko Minami
Tetsurō Sagawa
"Devil" Captain Goro Ryu
Shunichi Okita
Ichiroh Yamanaka
Masaaki Yamamoto
Tsutomu Konno
Akinori Umezu
Dan Umezu
Mahito Tsujimura
Ultraman (voice)
Osamu Saka
Ultraseven (voice)
Keisuke Yamashita
Ultraman Jack (voice)
Tetsuya Kaji
Father of Ultra (voice)
Shin Kishida
Narrator
