There has been a worldwide outbreak of kaiju disasters, and now a 50-meter-class space kaiju has appeared. Gento Hiruma leads a special unit to stop the advance of the kaiju, but they get stuck in a desperate situation. Gento rushes to save his men, but that's when the Blazar Brace appears on his left arm. Led by the light, Gento transforms into Ultraman!

As the network contamination by Gebalga continues to spread, SKaRD plans a new operation. Gento is distrustful of Blazar, who has once again acted against his will in the battle against Gebalga. He decides to leave the Blazar Stone in his locker. SKaRD decides to commence a major joint-operation by combining forces with the development team and the special forces unit.

The kaiju, Deltandal, is demolishing the city as it flies through the skies at Mach 9. Because Earth Garon cannot keep up with Deltandal's speed, SKaRD is unable to catch it. Meanwhile Emi finds out confidential information on the GGF labeled "V99" about space kaiju such as Bazanga and Gebalga. It seems to be related to a certain experiment that was conducted in the past.