Ultraman Decker and the TerraPhaser prove to be the ultimate duo! Kanata is overjoyed when the pair's successive victories increase their popularity around the world. Suddenly, the Spheresaurus appears again at the spaceport! It seems to be even stronger than last time. As the ultimate duo faces against the monster, a disturbing shadow begins to move...

"Humanity must not venture into space..."

Kanata and the others struggle to take in those words, but just then the small monster Spinnie appears, and a TPU all-member operation begins to capture it. After all of their plans to capture it fail and Spinnie makes fun of him, Kanata vents by saying something horrible to Ryuumon...