S1 • E1
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.
S1 • E2
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.
S1 • E3
A series of earthquakes are reported at Area T-7B. As Asuna and Daichi investigate in the subway, they meet a strange woman. She summons Telesdon until Daichi and Asuna manage to scare it off.
S1 • E4
Hayato and Wataru's rivalry for each other turns from bad to worse over time. During their lunch break, Alien Zarab reveals himself and launches Bemstar to wreak havoc in the city as Earth becomes his new target. Xio members deploy and Asuna attacks Bemstar, Daichi scans the monster, and Wataru and Hayato track down Zarab.
S1 • E5
While Xio members performing experiments to turn monsters into Spark Dolls, Black King appears and attacks the test site while Alien Nackle Bandero takes this opportunity to steal the Spark Dolls. Ultraman Zero appears and battles Black King but realizes that the plan failed, Nackle escapes with Black King and brings Rui as a hostage in another dimension. To save Rui, X and Zero join forces.
S1 • E6
A young man, tE rU is causing quite a stir, marching on the city inside the mechanical giant Rudian. Daichi sees tE rU heal an injured girl and believes the giant is not malicious, but others are unsure. Daichi and Ultraman X stop Rudian and inspect the giant, uncovering a shocking truth. A beast is heading to Earth, hungry for a secret held inside Rudian, and it's almost here.
S1 • E7
X is turned to stone by the dark beast Gargorgon, who has arrived to take the energy from Planet Gold stored within Rudian. Having escaped to Earth from Gold, tE rU laments how Daichi and X were petrified while protecting him. Gargorgon then demands that Earth surrenders and hands tE rU over. With the world facing this monstrous threat, can the officers of Xio defeat Gargorgon and restore X?
S1 • E8
After Ultraman X and Xio were unable to defeat Zetton, Dr. Kaito Touma visits them and gives them a Zetton Spark Doll to help with the creation of a new armor.
S1 • E9
Wataru's brother, Isamu always looks up on a dream of playing rugby. He was soon visited by a trio of aliens and gradually accepts them but the party were challenged by a group of evil aliens in a rugby match.
S1 • E10
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.
S1 • E11
While Daichi is frustrated from bringing Cyber Gomora to life, King Joe begins its attack and Ultraman X proves powerless when confronting the robot's assaults.
S1 • E12
An unknown female warrior revives Demaaga and it transforms into an even more menacing appearance. While X and Xio having a hard time attacking the female warrior and her accomplices, Alien Magma, Alien Shaplay and Zaragas, Daichi dwells into cyberspace to find X's data, where he finds a rainbow from his past.
S1 • E13
S1 • E14
Angered that the Guar Army's resistances is growing in forces, Mold releases all of the stolen Spark Dolls from Xio and tries to strengthen the Guar Army.
S1 • E15
Captain Kamiki attends his daughter's wedding but at the same time, Gomess appeared and worse, the monster was charged with the Dark Thunder Energy.
S1 • E16
A TV show was held where reporters would record Xio's daily routine for 24 hours. At the same an alien criminal network surfaces and plots multiple kidnappings.
S1 • E17
S1 • E18
A childhood friend of Wataru visits him. Meanwhile, a Space Cat Mu appears and terrorizes the city with a Red King/EX Red King.
S1 • E19
Daichi's Gomora has finally brought to life but turns berserk when the Dark Thunder Energy takes effect, as well as being controlled by an artificial life form.
S1 • E20
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.
S1 • E21
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.
S1 • E22
S1 • E23
In this episode, Daichi and X discuss themselves about the monsters they encountered since the first episodes while giving the viewers a sneak peek of the next episode's clip.
S1 • E24
A short recap of episodes 8 until 14.
Daichi Ozora
Asuna Yamasa
Wataru Kazama
Hayato Kijima
Mamoru Mikazuki
Rui Takada
Chiaki Matsudo
Sayuri Tachibana
Shotaro Kamiki
Ultraman X