|Super Weapon R-1|
|Ultraseven, Episode 26|
|Screenplay by||Bunzo Wakatsuki|
|Directed by||Toshitsugu Suzuki|
|Special skill director||Toru Matoba|
Showdown at 140 Degrees Below Zero
Two Ultra Guard scientists, Doctors Segawa and Maeno create a new devastating weapon -- the anti-planet device they christen the R-1. Even in its infancy, the R-1 is said to have the power of 8,000 Hydrogen bombs. With plans to build an even more deadly R-2 device, it is decided a test of the weapons capabilities will be done on the supposedly uninhabited Gieron star, a minor planet in some faraway galaxy. The test proves successful, but a giant flying creature doesn't take too kindly to its home being destroyed. Making its way to Earth, the monster attacks cities and emits radioactive ash. Ultraseven engages the beast in battle.
- Dan Moroboshi/Ultra Seven (モロボシ・ダン／ウルトラセブン（声） Moroboshi Dan/Urutorasebun?): Kohji Moritsugu (森次 晃嗣 Moritsugu Kōji?)
- Anne Yuri (友里アンヌ Yuri Annu?): Yuriko Hishimi (ひし美 ゆり子 Hishimi Yuriko?)
- Shigeru Furuhashi (フルハシ・シゲル隊員 Furuhashi Shigeru?): Sandayū Dokumamushi (毒蝮 三太夫, Dokumamushi Sandayū?)
- Kaoru Kiriyama (キリヤマ・カオル Kiriyama Kaoru?)： Shoji Nakayama (中山昭二 Nakayama Shōji?)
- Soga (ソガ Soga?): Shinsuke Achiha (阿知波信介 Achiha Shinuske?)
- Amagi (アマギ Amagi?): Bin Furuya (古谷敏 Furuya Bin?)
- Narrator (ナレーター Narētā?): Hikaru Urano (浦野光 Urano Hikaru?)
- Gyeron Monster (First appearance)
- As of March 2011, this episode has been banned from television in Japan due to the Fukushima Daiichi nuclear disaster.
- Ultraseven Volume 7 Features Episodes 26-29.