A Space Beast rampages in the midnight. At the same time, a Bemular was sighted at Canada, placing Lt. Sayuri's daughters in danger. While X is busy fighting one of them, another Ultraman emerge, namely Nexus.
The mastermind behind the Ultra Flare, Greeza, finally appears and absorbs the Spark Doll storage facility in UNVER Nevada branch. Setting its sight on Xio's Operation Base X, Ultraman X made himself known to Xio members and cooperates with them to defend the Spark Dolls.
The monster Houlinga appears at the edge of Sakane Village, but it does not show any intention of harming the village. The village's people then make the monster a tourist traction, however when Houlinga seem to be growing weak the village's mayor asks Xio to help the monster.
In outer space, two extraterrestrial beings clashed each other when one of them, the red figure, banishes his opponent, a purple figure, into the Sun. But this creates the Ultra Flare, which awakens Spark Dolls on Earth and causes them to run amok.
After several middle school students take a tour inside the Operation Base X, Daichi learns of Ultraman X's past being trapped in the form of computer data and swears to help him return to his physical body.