5 Seconds Before The Big Explosion! (S01E04)
A rocket carrying six nuclear bombs, intended for the exploration of Jupiter, experiences a malfunction and crashes into the ocean. Only one bomb detonates, resulting in a maritime catastrophe. The Science Patrol manages to recover four bombs but must now locate the missing one. Meanwhile, Fuji is granted a vacation by Capt. Muramatsu, igniting jealousy in Ide. She, along with Hoshino and a young girl named Michiko, heads to the Mamiyama Hotel for a fun getaway. However, Hayata investigates a maritime incident caused by the giant sea monster Ragon, which has been mutated by the bomb's radiation. This aggressive creature is heading toward the hotel, with the missing bomb attached to it! Will Fuji and the children be safe, and can Ultraman confront Ragon without triggering a disaster?