|"The Underground Destruction Work"|
|Directed by||Akio Jissoji|
|Air Date||December 11th, 1966|
To be added
Actor's name on the left, character played on the right.
- Hikaru Urano as Narrator
- Susumu Kurobe as Shin Hayata
- Akiji Kobayashi as Captain Toshio Muramatsu
- Sandayu Dokumamushi as Daisuke Arashi
- Masanari Nihei as Mitsuhiro Ide
- Hiroko Sakurai as Akiko Fuji
- Bin Furuya as Ultraman
- Masao Nakasone as Ultraman (grunts)
- Kunio Suzuki as Telesdon
- Annette Sonfers as Anne Morhim / Underground Woman
- Franz Gruber as Underground Person X
- Koji Yada as Underground Person X (voice)
- Despite being the twenty-second episode of the series, The Underground Destruction Work was the twenty-third episode to be made during the production of Ultraman.
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