|"Five Seconds Before the Big Explosion"|
|Directed by||Samaji Nonagase|
|Air Date||August 7th, 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
- Akihide Tsuwaza as Isamu Hoshino
- Bin Furuya as Ultraman
- Masao Nakasone as Ultraman (grunts)
- Izumi Umenosuke as Ragon
- Chikao Ohtsuka as Boat Patrol Member
- Kondō Michiko as Michiko
- Despite being the fourth episode of the series, Five Seconds Before the Big Explosion was the seventh episode to be made during the production of Ultraman.
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