There is an ancient human civilization on Earth, protected by the Ultra-Ancient Giants. Among the threats are the Kilaliens, who desire control over mankind but are stopped by the Ultras.
A civil war between the Ultras breaks out, most likely due to the machinations of the Giants of Darkness. Numerous giants are left as stones.
During this conflict Tiga falls in love with the original Yuzare. He turns to the side of good, ultimately resulting in his former companions being sealed away. Tiga then becomes a protector.
Humanity falls victim to the spores of the Gijera plant. Refusing to overturn the humans' free will, the remaining Ultras leave, leaving behind stone replicas of themselves. Tiga's statue is left in the Golden Pyramid with two others.
With their protectors gone, mankind is left defenseless against the onslaught of Kaiju, particularly the Zoiger and their master Gatanothor.
TPC recovers a time capsule and transfers it to GUTS for inspection. The time capsule contains a holographic message from Yuzare, warning them about Golza and Melba who are headed towards the three statues in a pyramid.
Daigo, one of the members of GUTS, witnesses Golza and Melba destroying two of the statues. He tries to protect the statue of Tiga but is shot down by Melba. He turns into light and is absorbed into the statue, awakening and giving life to Tiga. Tiga defeats Golza and Melba. Daigo is given the Sparklence to turn into the giant at anytime to fight evil monsters and aliens.
Darkness returns and resumes its domination of Earth.
Tiga stops Gijera, a servant of the Darkness, from unleashing its maddening pollen on mankind.
During his fight against Gatanothor, Tiga is defeated and turns back into stone. The giant is revived again through the Light of the children around the world. Tiga transforms into Glitter Tiga and defeats the Kaiju. Tiga and the Sparklence disintegrate soon after the battle.
Seiji Miyata participates in the first testing of the Neo-Maxima navigation system.
Development of New Maxima Drive-powered space warships and mobile bases commences.
Events of Ultraman Saga take place. Asuka contacts Super GUTS while traveling to an unknown destination, informing them that Nozomu Taiga is alive and well. Ryo promises Asuka that they will catch up to him one day, and Asuka smiles, giving a thumbs up, saying that he will be waiting for them before continuing his journey through space.