The Ultra Bracelet, Jack's main weapon, was one of them. Īt the beginning of the season, viewer ratings gradually decreased and various empowerment techniques were devised. At the time for the photo session for the first suit, the eye positions have changed, as they were slightly dragged upwards from the original and the back of the eyes were molded through transparent epoxy resin. His mask was molded on the original Ultraman's Type C mask by both Kaigome Production and Hiruma Model Craft. However, under the request of the toy company Bullmark, who acquired the commercialization rights for this series, the design had to be changed, as the character needed to be clearly differentiated from the original Ultraman, and thus his scenes needed to be re-shot with a new suit. The first suit was based on this design and filming started at that moment. The initial design was made by then-manager of Tsuburaya Production's sales management Masahiro Sueyasu ( 末安 正博, Sueyasu Masahiro) by adding lines on it under the impression that he was the original Ultraman. The designer of Ultraman Jack was ambiguous as, according to the art staff, Akihiko Takahashi ( 高橋 昭彦, Takahashi Akihiko) was said to be in charge of the main design, but said artist denied his participation as he believed that the design's brush style was "akin to that of Noriyoshi Ikeya ( 池谷 仙克, Ikeya Norihoshi)", with the latter likewise choosing not to acknowledge it as his own work. This kind of setting would be known as "Human Ultraman" ( 人間ウルトラマン, Ningen Urutoraman). The injuries and struggles from fighting monsters were also passed onto the human identity. In addition, the protagonist is a person who had the abilities of Ultraman, thus outclassing fellow MAT members in terms of skills, and emphasized the efforts shown to overcome daily difficulties.
In contrast to Shin Hayata and Dan Moroboshi, Jack's host, Hideki Go, is portrayed as a man who has a private life outside of his duty as a MAT officer, including his aspiration as a race car driver, living with the Sakata siblings and having a neighbor named Rumiko Murano. In the planned third volume, Muramatsu and Hayata of the Science Special Search Party were meant to return, and a character named Hideki Ban ( バン・ヒデキ(晩 日出輝), Ban Hideki) would inherit the Beta Capsule and bond with Ultraman. The book's setting was that Ultraman returned to Earth 30 years after the end of his titular series. The entire project began with a book published on April 28, 1969, starting from Ultraman Continues ( 続ウルトラマン, Zoku Urutoraman), featuring the return of the original Ultraman and the establishment of the attack team MAT.
In Return of Ultraman, Ultraman Jack's lines were provided by Isao Yatsu ( 谷津 勲, Yatsu Isao, 1, 18, 30, 31, 37) and Ichirō Murakoshi ( 村越 伊知郎, Murakoshi Ichirō, 50), both of whom even voiced several of the aliens that appeared, including the original Ultraman and Ultraseven's returning appearances.
Even with his series ended, Jack would make returning appearances in recent media of the Ultra Series.
Following Jack's departure in the final episode, the series would be succeeded by Ultraman Ace, Ultraman Taro and Ultraman Leo before entering a hiatus, a trend which can still be seen to this day. Additionally, Return of Ultraman also served as a milestone celebration for the fifth anniversary of Ultraman and the newly established Ultra Series. Return of Ultraman marks the connection of Ultraman and Ultra Seven as Ultra Series installments, which eventually lead to multiple sequels and spin-offs for Tsuburaya Productions with various heroes named after it.
Jack bonded with the race car driver Hideki Go to save his life and as the former's means to operate on Earth while they joined MAT to fight against monster attacks and alien invasions. Sometime after Ultraseven's departure, Earth had entered a period of peace until a string of incidents wherein monsters awakened from slumber, appearing one after another. Ultraman Jack ( ウルトラマンジャック, Urutoraman Jakku) is the protagonist of the 1971–1972 tokusatsu Ultra Series, Return of Ultraman.