Extreme weather around the world awokened the monsters all in once. During a fight between the Monster Attack Team and monsters Takkong and Zazarn, Hideki Go, a young man chasing for his dream of becoming a professional racer, died saving the lives of a child and a dog

The monster Takkong appeared again! Go became overconfidence after gaining the power of Ultraman and disobeyed the captain's orders, only led to the escape of Takkong. Expulsed by MAT, he returned to Sakada Car Factory, but is welcomed coldly by Sakada. This made Go realize his arrogance.

Go heard a monster's roar during a patrol over Mt. Kirifuki. However, the roar could only be heard by Go because of his extrasensory. Ueno, who was riding with Go, did not hear the sound and started an arguement with Go. To find out the truth, Captain Kato went for Mt. Kirifuki alone and there appeared monster Sadora. Kato is in danger!

Ancient Monster Kingsaurus III appeared near the No. 1 Nuclear Power Plant. Go fought as Ultraman but his super attack was not effective. The only way to defear Kingsaurus III is to acquire a kick that could jump over the barrier made by the monster. With the help of Sakada, Go started his intensive training.

A rock-like object was found in a construction side. While Go and Kishida were arguing about how to deal with it, Underground Monster Gudon appeared in a quarry. On the other hand, Ancient Monster Twintail came out of the rock-like object, bringing panic to Tokyo's Shinjuku, the subcenter of Tokyo. Go transforms into Ultraman to fight Twintail, until Gudon came as well

Ultraman lost against the two giant monsters. After MAT's MN Bomb didn't work out, Commander Kishida decided to use "Spiner", a weapon with the power of a mini hydrogen bomb. Captain Kato strongly fought agianst the idea because if Sniper was used, Tokyo will be destroyed. MAT started an operation not involving Sniper, but if they failed, the team wil be dissolved.