A Warrior's Duty

is the fifteenth episode of Ultraman Z.
==Synopsis==
Emergency contact from Ultraman Geed! It seems that a distortion is created in the universe, and a void monster, Greeza, who returns everything to nothing, appears. We need new power to face this threat! Yes, the strongest figure of Ultraman Z is born here now!
==Plot==
During the evening after Z defeated Bullton, several construction workers went missing after hearing ominous laughter. Meanwhile, in deep space, Riku Asakura and Pega noticed something was wrong, and made their way towards Earth to help.
The following day, Riku communicated to Haruki Natsukawa about the danger of what was approaching Earth, identifying it as Greeza, a being born of a tear in space. Riku arrived just in time, for just as he had predicted, Greeza mounted an attack on the city, switching between his first and second forms to cause massive devastation. Meanwhile at STORAGE's HQ, Yuka theorised that the destruction of Bullton had directly led to a rip in the space time continuum from which Greeza had emerged, and that while capable of being destructive, reality warping organisms like Bullton had a role in maintaining the integrity of the universe by manipulating its fabric. If Greeza were to be allowed to continue to attack Earth unchecked, the entire planet would soon become consumed by the void.
Riku and Haruki transformed into Geed and Z to fight the mysterious being, but not before Riku presented Haruki with Geed's Ultra Medal, to use if anything happened to him. The two Ultras were unable to land a hit on Greeza due to its intangibility, and were completely outmatched against Greeza's attacks. Shota Hebikura stepped in to help, and was able to find some success in transforming into Tri-King, then Five King, but he too was unable to hurt Greeza despite his attacks connecting, and eventually disappeared after becoming overpowered, with Jugglus Juggler forced to revert back to normal. With seemingly no choice left, Geed charged Greeza, and seemingly disappeared! Greeza's first form floated in the sky, seemingly inactive. Further analysis by Yuka found that Geed was starting to fuse with Greeza.
From inside the rift, Geed was growing increasingly weaker as the fusion was taking place. Unable to get to his feet, he was struck by an unknown object that made him bleed, producing a point of red light that disappeared into the distance.
In a conversation with Z, Haruki learned that Geed was doomed to cease to exist after the fusion with Greeza was to be completed, unless Z could attain a stronger form using a combination of the Zero Medal, Geed Medal, and an Ultraman Belial medal, but at the same time, Z confirms that such medal should not exist yet, leaving Haruki with a sense of helplessness. Shortly afterward, Jugglus Juggler approached Haruki, apparently having overheard his conversation with Z, and told him to drive him to a specific location, being the hideout of Celebro's host, Shinya Kaburagi, who Haruki had no knowledge of at this point.
Jugglus Juggler and Haruki stormed Kaburagi's hideout with flash grenades and energy guns, and the host fought back with weapons of his own, but eventually, Juggler was able to overpower Kaburagi, convincing him to hand over the Ultraman Belial medal, having known that the alien's host had managed to create one. Haruki was confused as to why Juggler was referring to Kaburagi as Celebro, not being familiar with the name, but Juggler urged him to attempt to use the medal and transform. As Haruki left, Juggler reverts back to Hebikura and says that he depends on the young Ultra this time.
Haruki manages to contact Z that he receives the Belial medal, much to Z astonishment. Haruki then took out Zero and Geed's medals from his Z Holder and along with Belial, the rim of those medals turned to gold. Furthermore, the Zero Medal turned into Zero Beyond Medal, with the Belial Medal similarly becoming upgraded into the Belial Atrocious Medal, indicating that the power up process had been successful. 
As Haruki loaded both the Zero Beyond and Geed Medal into the Z Riser, trouble immediately began when Haruki attempted to load the Belial Medal into his Z Riser, as since the medals it was to be combined with, those of Zero and Geed, were rivals to Belial in reality, a repelling effect was created that made attempting to move the Belial Medal towards the Riser extremely difficult. Greeza, meanwhile, was starting to attack again, and had been granted the use of Geed's Wrecking Burst because of the fusion!
With Z's help, Haruki was able to push back against the repulsion force, loading the Medal into the Riser. With a new form unlocked, Z transformed into the new Delta Rise Claw form. This new form manages not only to match Greeza power, it also separates Geed from the Kaiju. Geed then informs Z that inside the void, he sensed that a needle to seal Greeza is born inside of it. Using the Z riser as catalyst, Z impales Greeza body and reclaim the needle, which took the form of Beliarok, a sword with handguard resembling Belial head, and capable of speech and intelligence.
Beliarok initially refuses to cooperate with Z, claiming that he only wants to slice whatever, and whenever he wants, becoming too heavy to move. Haruki decided to introduce himself to the sword and explained that there's a hole in the space that shouldn't have existed. Amused and impressed by Haruki's straightforward nature, Beliarok agrees to help them. Using Beliarok, Z manages to inflict serious damage to Greeza. Finally, using Deathcium Slash, Z defeats Greeza.
The next day, Riku appeared in his Ultra form in front of Haruki. Geed explained that since Ultraman Hikari manages to fix his Geed Riser, Geed didn't need to use the Ultra Medals anymore. Thus, he gives Ginga, X and Orb Medal to Haruki, and entrust Belial Medal to him. When Haruki asks where he'll go, Geed replied that he intended to protect another universe and search for Devil Splinters along the way, because it is his duty to do so. After Geed departs, Haruki looked at the sky with renewed determination.
===Haruki's Ultra Navi===
*Haruki: Haruki's Ultra-navi! 'Kay! Today we're showing this!
*Z Riser: Geed.
*Z: My senior disciple, Geed! He's Belial's son, but he's a hero who fights for justice!
*Z: Next up is...
*Z Riser: Greeza.
*Haruki: A monster that's like a hole in space. We barely managed to fight it with Delta Rise Claw and Beliarok's help.
===Rerun episode segment===
Haruki and Z discusses the meaning behind Hebikura's advice of "not to trust one's eyes alone".
==Ultraman Z and Ultraman Zero Voice Drama==
Z asks Zero about his ultimate form. Zero cannot choose which form is the strongest. He then gives the examples and their potential, which includes Ultimate Zero, Shining Ultraman Zero, and Zero Beyond.
==Cast==
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===Voice Actors===
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===Suit Actors===
*Ultraman Z: 
*Ultraman Geed: 
*Greeza: 
*Jugglus Juggler: 
==Appearances==
===Ultras===
*Ultraman Z
**Original
**Alpha Edge
**Delta Rise Claw
*Ultraman Geed
**Primitive
**Galaxy Rising
===Kaiju===
*Alien Pegassa Pega
*Jugglus Juggler
*Greeza
*Tri-King/Five King
Category:Multi-Part Episodes
Category:Team-Ups