Execution! The Five Ultra Brothers (死刑! ウルトラ5兄弟 Shikei! Urutora 5 kyōdai) is the thirteenth episode of Ultraman Ace. It is the first part of a two-part arc which features the previous four Ultra Brothers a second time.
Early in the morning, a pair of newspaper deliverymen brothers caught the sighting of a Terrible Monster. The younger brother Shoji managed to escape but his older brother Ichiro was killed when the public phone booth he was trapped in slammed onto the ground. Shoji's words about the Terrible Monster was dismissed by many and his brothers' death was wrongfully labelled as an accident.
At that same morning, the TAC's radar captured the image of Planet Golgotha, which had its namesake from the Biblical location where Jesus Christ was crucified. True to form, the planet in TAC's snapshot is shaped like a human skull and is located in the minus universe (an antithesis to the solar system). During their patrol, Hokuto and Minami are notified of an Ultra Sign for the Ultra Brothers to gather at Planet Golgotha through their blinking Ultra Rings.
Arriving on Planet Golgotha, Ultra Brothers claimed to have lured into the sign supposedly from Ace and vice versa. They discovered five Christian crosses with their signatures scribbled on it. All of the sudden, Yapool unleashes Baraba to Earth and accompanied with a radioactive-laced raindrops. The brothers were too late to discover the trap and was exposed to a freezing gas. With little energy left, they donated their portion to Ace for him to return to Earth, leaving the Brothers vulnerable to Yapool's crucifixion. On Earth, Hokuto and Minami fetched Yamanaka and Konno in their TAC Panther away from Baraba. Hokuto noticed Shoji and managed to lure him away from the battlefield, promising him to avenge for Ichiro. Ace appeared, rescuing Mikawa and fought the Terrible Monster despite the latter being protected by the radioactive rain. Yapool interrupted their fight and threatened Ace with the captured Ultra Brothers, forcing Baraba to have its own way and emerged as the victor.
- Seiji Hokuto (北斗星司 Hokuto Seiji): Keiji Takamine (高峰 圭二 Takami)
- Yuko Minami (南夕子 Minami Yūko): Mitsuko Hoshi (星光子 Hoshi Mitsuko)
- Goro Ryu (竜五 郎 Ryu Goro): Tetsurō Sagawa (瑳川哲朗 Sagawa Tetsurō)
- Ichiro Yamanaka (山中一郎 Yamanaka Ichiro): Okita Shunichi (沖田駿一 Shunichi Okita)
- Tsutomu Konno (今野勉 Konno Tsutomu): Masaaki Yamamoto (山本正明 Yamamoto Masaaki)
- Noriko Mikawa (美川 のり子 Mikawa Noriko) Keiko Nishi (西恵子 Nishi Keiko)
- Kozo Yoshimura (吉村公三 Yoshimura Kozo): Koyo Sano (佐野光洋 Sano Koyo)
- Kaji Yoichi (梶洋一 Yoichi Kaji): Katsumi Nakaiyama (中山 勝己 Nakaiyama Katsumi)
- Ultraman Ace (ウルトラマンエース Urutoraman Ēsu): Gorō Naya (納谷悟朗 Naya Gorō)
- Yapool (ヤープル Yapurū): Hirofumi Takada (高田裕史 Takada Hirofumi)
- Ultraman (ウルトラマン Urutoraman): Masato Tsujimura (辻村真人 Tsujimura Masato)
- Zoffy (ゾフィー Zofī): Osamu Ichikawa (市川治 Ichikawa Osamu)
- Ultraseven (ウルトラセブン Urutorasebun): Michihiro Ikemizu (池水通洋 Ikemizu Michihiro)
- Ultraman Jack (ウルトラマンジャック Urutoraman Jakku): Keisuke Yamashita (山下啓介 Yamashita Keisuke)
- Narrator (ナレーター Nareta): Shin Kishida (岸田森, Kishida Shin )
- Shoji (昭二 Shoji): Toshitaka Someya (染谷利貴 Someya Toshitaka)
- Ichiro (一郎 Ichiro): Masahiko Nezu (根津雅彦 Nezu Masahiko)
- Ultraman Ace (ウルトラマンエース Urutoraman Ēsu): Shoji Takeuchi (武内正治 Takeuchi Shoji)
- Baraba (バラバ ): Isao Zushi (図師勲 Zushi Isao)
- Ultraman Ace Volume 4 features episodes 13-16.