|"Secret of the Miloganda"|
|Directed by||Toshihiro Iijima|
|Air Date||August 14th, 1966|
To be added
Actor's name on the left, character played on the right.
- Koji Ishizaka 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
- Akihiko Hirata as Dr. Iwamoto
- Bin Furuya as Ultraman
- Masao Nakasone as Ultraman (grunts)
- Harekichi Nakamura as Greenmons
- Keizō Sasagawa as Dr. Yamada
- Tadashi Okuno as Dr. Matsuo
- Akiko Wakabayashi as Setsuko Hamaguchi
- Hiroshi Yamanaka as Jiro Kobayashi
- Michiru Maki as Miss Maki
- Despite being the fifth episode of the series, Secret of the Miloganda was the second episode to be made during the production of Ultraman.
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