Showdown at 140 Degrees Below Zero (零下140度の対決 Reika Hyakuyonjū-do no Taiketsu) is the 25th episode of Ultraseven.
A monumentally deadly snowstorm engulfs the Earth. The Ultra Garrison headquarters is frozen after a mysterious monster drills underground and breaches the walls of the base. Meanwhile, Dan Moroboshi is stranded in increasingly freezing temperatures. He loses his Ultra Eye in the blizzard and is attacked by the giant alien monster, Gandar. Unable to transform into Ultraseven, he sends one of his capsule monsters to do battle. Meanwhile, Commander Kiriyama and the Ultra Garrison try to restore power to the base. During the monster battle, Moroboshi finds the Ultra Eye, but with a depleted solar power, he can't fight the monster. Ultraseven must then fly into the sun to replenish his energy leaving Miclas and the Ultra Hawks to fight Gandar alone.
- Dan Moroboshi/Ultraseven (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)
- Ultraseven (ウルトラセブン Urutorasebun): Uenishi Hirotsugu (上西弘次 Hirotsugu Uenishi)
- Ultraseven Volume 6 Features Episodes 22-25.