2019: Apocalypse

is the forty-ninth and final episode of Kamen Rider Zi-O. It is the third and final part of the Kamen Rider Decade tribute arc, with the episode being a tribute to the entire Heisei era itself. It is also the final part of Zi-O's three-episode endgame arc. It features Sougo's transformation into Ohma Zi-O, the revivals of both Heure and Ora, having died in episodes 45 and 46 respectively.
==Synopsis==
Bear witness to the birth of Kamen Rider Tsukuyomi! However, this miraculous power will be used in an unexpected way! Did Tsukasa and Sougo's plan ultimately fail?! As the end of the world is approaching, much to the contrary of what the situation might show, Sougo's heart remains terrifyingly calm! Because hidden deep within him lies his secret resolution...
==Plot==
Tsukuyomi has achieved success in becoming a Kamen Rider! But, as she moves forward, she stops time and kneels down to her brother, Swartz, pledging her loyalty. Having been seemingly betrayed, everyone else retreats as Swartz roars with laughter.
Sougo, Geiz, Woz and Tsukasa Kadoya return to 95 DO to discuss the recent situation. Tsukasa's original plan was to make Tsukuyomi a Kamen Rider because the cause of her world's destruction is the absence of a Kamen Rider there. Ideally, once Tsukuyomi becomes a Kamen Rider, she would return to her homeworld and then create a link with Sougo in his world, uniting both. Still, this plan lacks the means to migrate billions of beings on Zi-O's world to Tsukuyomi's homeworld.
Meanwhile, in the city, Tsukuyomi tells her brother about Tsukasa's plan. Swartz agrees with the plan, especially after Tsukuyomi promises to support Swartz's rule as the king in the new world.
The following morning, Sougo has breakfast with Junichiro. The uncle tells him not to make this their last meal together, and that he should come home with his friends when everything is resolved. Before Sougo departs for the final battle, Junichiro presents him with the repaired 18 Heisei Ridewatches, citing that for a master horologist like him, there is no watch he cannot repair.
In the city, the horde of innumerable villianous beings are wreaking havoc everywhere. Geiz, Woz, Tsukasa, and Daiki continue fighting to protect the civilians, but the enemies are resurrected endlessly, overwhelming the four Riders. The situation becomes even worse when Swartz summons some of the strongest villians of Riders. N·Daguva·Zeba brings down the absolute darkness from Kurogatake Mountains, Kamen Rider Evol consumes people inside his black hole, Gamedeus begins infecting people with the Gamedeus Virus, and the Sagittarius Zodiarts and Utopia Dopant slaughter civilians.
With the help of Tsukuyomi, Another Decade defeats the four Riders, taking them out of the battle. Before he could go on, Sougo arrives with the newly-restored GrandZi-O Ridewatch and summons Kamen Rider Build TankTank Form, Drive Type Formula, Ghost Ore Damashii, and Ex-Aid Maximum Gamer to assault Another Decade, disappearing as they finished their attack. Sougo then proclaims that Swartz can destroy history all he wants, but the Kamen Riders will exist forever. After that, Sougo transforms into GrandZi-O and summons OOO Tajadol Combo, Gaim Pine Arms, Wizard Infinity Style, and Double CycloneJoker Xtreme to aid him in battle, but the final bosses wipe the floor with them. Finally, with the combined strength of the final villains, Swartz defeats Sougo too, reverting him to human form.
Swartz blasts Sougo with the intent to kill, but suddenly GeizRevive Shippu comes in its path and sustains critical injuries. Sougo cradles the dying Geiz, and he finally confesses that he feels very happy that he came to 2018 and befriended Sougo. Geiz, one last time, calls Sougo by his name and asks him to become Ohma Zi-O, the strongest and kindest king he can be, before succumbing to his wounds. Stricken with grief, Sougo's Ziku-Driver transforms into the golden Ohma Zi-O Driver.
An extremely angered Sougo heeds Geiz's advice and transforms into the Demonic King of Time, Ohma Zi-O, which even renders Woz speechless. In a deep growl, he orders the prophet to announce his ascension and he does so. Swartz laughs in elation at seeing the rise of the demon King, because, with that, he can finally absorb Sougo's powers to rule the world. He begins absorbing said power but it backfires because Ohma Zi-O's power is the power of All Kamen Riders and someone like Swartz is too unworthy for them. As Swartz doubles in pain, he commands the final bosses to kill Sougo.
Ohma Zi-O begins the most one-sided battle of his life when he destroys all final bosses in one hit and even thins out the horde of Riders' enemies easily. In a desperate attempt, Swartz tries to retreat to his world and use what little of Ohma Zi-O's power he has to rule as king, but Tsukuyomi shockingly betrays and stabs him from behind, saying that this world does not need a king like him. An enraged Swartz easily dispatches Tsukuyomi after hearing this. Finally seeing that Swartz has killed all those that he held dear, an even further incensed Sougo howls in anger before he executes the Ohma Zi-O Hissatsu Geki. Swartz attempts to block the attack, but the immense power being displaced by the kick is more powerful than even he can withstand, and he gets knocked back and explodes in a massive fireball, killing him and destroying his legions of drones and the Another Decade Ridewatch with him, finally ending his tyrannical dominion over the 20 Heisei Rider Worlds once and for all.
In the future, Swartz is disintegrating before Tsukuyomi, who tells him to let go of his foolish actions and admit that no matter what he does, he cannot defeat the greatest and kindest king of time, Ohma Zi-O. Swartz tells her that he still does not care about her opinion, before he is finally erased from existence. Tsukuyomi makes one final request to Sougo before she disappears: she is entrusting him with the future of her world as well as his.
Black Woz, who had seen the battle from afar, approaches Sougo and congratulates him on saving the world before pledging his everlasting loyalty to the newly crowned king. Shockingly, though, Sougo tells Woz that he does not want to rule and that he intends to destroy this timeline. Before he can do so, however, he is brought before his future self. The old Zi-O asks if Sougo is willing to discard his dream to be a king and Sougo answers that ruling no longer matters if all of his friends are dead. With that answer, the old Zi-O is pleased as his mistakes are getting resolved and, being happy to meet him, he is erased from the world.
As Sougo destroys the timeline, Tsukasa and Daiki watch from a distance. Tsukasa tells Daiki that his adventure in the World of Zi-O is finally ending and he looks forward to another adventure in the future. After that, the united world re-separates into the Rider Worlds as well as the World of Swartz, which finally restores the timeline and makes it look as if nothing had ever happened.
In this restored timeline, Sougo returns as a normal high school student at the end of the 2018 summer vacation. As he departs for school, he meets his school mates, Geiz and Alpina. Ora and Heure are also here too, having become Sougo's underclassmen. The five friends then go to school together, surely to lead an ordinary life. The episode and season conclude with Black Woz, who was saved from the reset, observing his king and writing down:
==Cast==
*: 
*: 
*: 
*: 
*: 
*: 
*: 
*: 
*, Ziku-Driver, Ridewatch Voices: 
*Ziku-Driver Voice: 
*Beyondriver Voice: 
===Guest Cast===
*: 
*: 
*NeoDecadriver Voice, NeoDiendriver Voice: 
===Suit Actors===
*Kamen Rider Zi-O, Ohma Zi-O: 
*Kamen Rider Geiz: 
*Kamen Rider Woz: 
*Kamen Rider Tsukuyomi: 
*Kamen Rider Decade: 
*Kamen Rider Diend:
*Another Riders:
*Another Decade: 
==Forms and Collectibles Used==
===Ridewatches===
*Watch used:
**Zi-O
***Zi-O, GrandZi-O
**Geiz
***Geiz, GeizRevive
**Tsukuyomi
***Tsukuyomi
*Rider Armor(s) used:
**Zi-O
***GrandZi-O
**Geiz
***GeizRevive Shippu
*Kamen Rider(s) summoned in GrandZi-O:
**Build TankTank Form (From Build Episode 35), Drive Type Formula Mantarn (From Drive Episode 23), Ghost Ore Damashii (From Ghost Episode 1), Ex-Aid Maximum Gamer Level 99 (From Ex-Aid Episode 23), OOO Tajadol Combo (From OOO Episode 20), Wizard Infinity Style (From Wizard Episode 31), Gaim Pine Arms (From Gaim Episode 2), Double CycloneJokerXtreme (From W Episode 32)
*Weapon(s) summoned in GrandZi-O:
**Zikan Girade, Saikyo Girade
Legend Rider Summon - Kamen Rider Build TankTank Form.png|Build TankTank Form
Legend Rider Summon - Kamen Rider Drive Type Formula Mantarn.png|Drive Type Formula Mantarn
Legend Rider Summon - Kamen Rider Ghost Ore Damashii.png|Ghost Ore Damashii
Legend Rider Summon - Kamen Rider Ex-Aid Maximum Gamer.png|Ex-Aid Maximum Gamer Level 99
Legend Rider Summon - Kamen Rider OOO Tajadol Combo.png|OOO Tajadol Combo
Legend Rider Summon - Kamen Rider Wizard Infinity Style.png|Wizard Infinity Style
Legend Rider Summon - Kamen Rider Gaim Pine Arms.png|Gaim Pine Arms
Legend Rider Summon - Kamen Rider Double CycloneJokerExtreme.png|Double CycloneJokerXtreme
===Miridewatches===
*Watch used:
**Woz
***Ginga
*Form(s) used:
**Woz
***WozGingaFinaly
===Rider Cards===
*Card Used:
**Kamen Rider Decade:
***Kamen Ride: Decade
***Attack Ride:
***Form Ride:
***Final Form Ride:
***Final Attack Ride: Decade
***Final Kamen Ride:
***K-Touch:
**Forms:
***Decade
**Kamen Rider Diend
***Kamen Ride: Diend
***Attack Ride:
***Final Form Ride:
***Final Attack Ride:
==Errors==
*In the credits, Masahiro Inoue and Kimito Totani do not have the names, Kamen Rider Decade and Kamen Rider Diend next to their characters names even though they were transformed in this episode.
*When Decade inserted the Final AttackRide Card to NeoDecadriver, the text displays "AttackRide: Slash" on the buckle, while it announces "Final AttackRide: De-De-De-Decade!".
*In the GrandZi-O transformation sequence since the thirty-ninth episode, the CGI pedestals once again are placed perspectively wrong along with visible green screen lines.
**In addition, when Sougo rotates his belt, the clock's hand stop at the wrong spots.
*The GrandZi-O Ridewatch was reformed even though the Decade Ridewatch isn't in Sougo's possession anymore and was returned to Tsukasa in episode 47.
**Although, GrandZi-O did fight simultaneously with Decade against Another Zi-O II in the same episode as well. This may indicate that the GrandZi-O Watch is usable as long as the original Ridewatch or power stays intact.
**In addition to that, the Decade Ridewatch is also present among the watches absorbed by Ohma Zi-O.
==Notes==
==External links==
*TV Asahi's official episode guide for 2019：アポカリプス
*Heisei 20's official episode guide for 2019：アポカリプス
==References==
ru:2019: Апокалипсис
Category:Season Finale
Category:Crossovers
Category:New Form Episode
Category:Rider Death Episode
Category:Revived Rider Episode