A clash between two extraterrestrial forces causes a solar flare that awakens monstrous Spark Dolls, which run wild over the Earth; fifteen years later, one member of a defense team searching for answers encounters the powerful alien Ultraman X.

Middle school students get a tour of Operation Base X and Daichi finds out how Ultraman X became trapped in his digital form and vows to help him out of his predicament; Xio and Ultraman X must rescue humans trapped in a birdlike monster's nest.

While investigating reports of earthquakes, Asuna and Daichi encounter a mysterious woman with the ability to summon the monster Telesdon, which runs rampant over Area T-7B.

Hayato and Wataru must put their differences aside when an alien attack overwhelms the team, leading to Daichi's apparent death and Ultraman X's kidnapping.

After Black King and Nackle Bandero attack a test facility to obtain Spark Dolls, Rui unwittingly accompanies them back to planet Guillermo and Ultraman X must team up with Ultraman Zero to save her.

Controversy surrounds a kindhearted alien whose robot goes out of control and terrorizes the city; the alien warns Xio of an ancient extraterrestrial menace headed for Earth.