Escape Space X (空間X脱出 Kūkan X Dasshutsu) is the 18th episode of Ultraseven.
On a skydiving exercise, Amagi and Soga disappear, landing in a fog enshrouded forest in what seems like some alternate dimension. Separated from Soga, Amagi is immediately attacked by small blood-draining leech creatures; and a giant spider Gumonga that emits noxious gas. Finding Soga and finally regaining contact with the Ultra Guard, the two Garrison members find themselves trapped within a monster-filled "Virtual Space" created by a race of aliens known as Bells, insect-like creatures with the power to cause ear-piercing sonic attacks on their enemies.
- 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 Volume 5 Features Episodes 18-21.