Dark Zone (ダーク・ゾーン Dāku Zōn) is the sixth episode of Ultraseven.
Upon returning from investigating a mysterious light source, Dan is called to agent Anne Yuri's quarters after a strange shadow like figure appears there. Claiming to be injured, Dan and Anne sit and talk to the shadow shaped figure, although the alien is equally shadowy about answering questions. Meanwhile, central control receives an alien signal from the planet Pegassa asking that Earth adjust its orbit to avoid a collision that would destroy both the Earth and the Pegassan metropolis. In an effort to avert total annihilation, Commander Manabe orders the city of Pegassa destroyed. But the Pegassas have plans of their own as well.
- 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): Koji Uenishi (上西弘次 Hirotsugu Uenishi)
- Ultraseven Vol 2 Features Episode 5-8