- Written by Riku SanjoDirected by Hidenori Ishida
Drive escorts Kiriko to safety, while Mach and Chaser fight 004 and Gold Drive before the latter flee. Brain uses the stolen tablet to link into Medic's system and finds a shocking truth about her programming. She appears behind him with three Reapers but instead of running, Brain surrenders.
Kiriko was hospitalized after the event and while Chase and Go tries to take a visit, they see Shinnosuke at the front door of Kiriko's ward bringing some gifts and orders Chase to give them to Kiriko, much to Go and Mr. Belt's surprise. In the SSDC headquarters, news of all four Super Evolved Roidmudes had reached the Special Investigation Unit and Akio. With the second Global Freeze may affect worldwide, Rinna introduces Pikopiko 4, a lighter version of Pikopiko 3 with five having been created so far. Rinna introduces the Mach Driver Production Model and its wearer Jun, as he demonstrated it and transforms into the first production model of Kamen Rider Mach, aka. Kamen Rider Jun. But an error occurs which renders the suit suddenly immobile, and Akio gives them some more time to finish the suit.
Chase visits Kiriko and asks her if she harbors feelings for Shinnosuke, which she denies. Chase however, believes that she lied much like Shinnosuke, and sheds tears but willingly holds the burden as it makes him feel closer to be a human. Soon, several places had been declared a state of emergency and the police forces, including Special Investigation Unit are searching for the Promised Land. Meanwhile, Rinna and Kyu had stay all night to mass produce the Pikopiko 4 as quickly as possible. Heart chastises Brain for surrendering to Banno. Gold Drive reveals 004's creation, Sigma Circular and orders the party to head to the Promised Land. Brain adopts his true Roidmude persona and throws away his handkerchief as a first step of shedding his humanity.
At the supposed location of the Promised Land (a lakeside), a group of Roidmudes appear for the ceremony of the Promised Numbers, as police officers hide for guerrilla attacks. The Kamen Riders arrive late and Genpachiro reveals that the location was leaked by "Mr. X" but Go denies to having using that nickname again. The Kamen Riders act first to attack the ceremony but Low-Class Roidmude and Reaper Legions block their way. With the Super Evolved Roidmudes exhausted, Genpachiro and the special forces try to aid the Riders but the Sigma Circular activates and reveals its true purpose: to absorb and recreate the energies of Super Evolved Roidmudes for the creation of Global Freeze. But to stabilize its excess power, one must become a sacrifice to it and that person is Medic, whom Banno brainwashed with the trojan program and modified with a targeting program to direct the energy to her body. Her death would also ensure that no means of healing for Roidmudes would exist, so if the Roidmudes begin to rebel, Gold Drive could easily slaughter them all as punishment. Seeing Heart loves her more than anyone, Brain relocates the target program from her body to himself, at the same time saving her from Gold Drive's trance.
Eventually, Brain's largest gambit proves fatal, releasing a huge explosion and in his final moments wishes Medic to take care of Heart before rusting away into nothingness and his core disintegrates. Tired of his devilish acts, the Riders attack but once again are occupied by their enemies until they finish them with Full Throttles. With Banno surrounded by the Kamen Riders and Roidmude Executives, 004 surprisingly survives and reveals that this place is not the Promised Land but rather a place for the ritual. Banno laughs insanely and confirms this and reveals that he was the one that lured all of them here under the name Mr. X. He traps them all in an electromagnetic field and 004 commits a kamikaze attack via self destruct so Gold Drive can escape, seemingly killing all of them in one blow as Banno plots the end of the world with the Global Freeze.
- Break His Heart to Save Him: Brain surrenders to Banno, realising that there's nowhere he can go that Banno can't find him. Heart is equal parts enraged and heartbroken to be betrayed by his closest comrade. It's all part of his plan to save Medic and break Banno's hold over the Roidmudes.
- Call-Back: When Genpachi tells them he received a tip from someone called Mr. X, Shinnosuke and Chase look at Gou, who then claims that it wasn't him this time, referencing episode 33 when the Special Cases Unit discovered that Gou was the Mr. X giving them info on the Freeze Roidmude case while working with him.
- Comical Overreacting: Kiriko's reaction to Chase's question on how she feels about Shinnosuke.
- Dying Moment of Awesome: Brain dies sacrificing himself to free Medic from Banno's control, simultaneously freeing Heart by extension (as Heart was only on Banno's side for Medic's sake), and on top of that robbing Banno of the fourth Super Evolved Roidmude needed for his plans (which indirectly results in 004 self destructing. He basically does more damage to Banno with his death than the Riders, the Roidmudes, and Krim combined had been able to do.
- Flawed Prototype: The Police Driver Chief Honganji wears during his demonstration. While he successfully transforms, the Driver doesn't seem to give him the same resilience enjoyed by Kamen Riders Drive and Mach.
- Heartbroken Badass: Upon seeing Kiriko's reaction to his question about her feelings for Shinnosuke, Chase concludes she is equally in love with him. He also concludes that he is feeling heartbroken but resolves to continue fighting on and is glad to feel such a human emotion.
- Luminescent Blush: Kirkio effectively develops one after Chase outright asks her if she loves Shinnosuke.
- Made of Iron: Despie being unevolved, 004 survives Type Tridoron's Attack 1-2-3 Finisher, though he's clearly badly hurt.
- No Social Skills: Chase? Buddy? Maybe you want to wait until people have finished eating or drinking before outright asking them if they're in love with their police partner?
- Sarcastic Clapping: 004 does this after Heart uses himself as a human shield.
- Senseless Sacrifice: While he succeeds in saving Medic, Brain's secondary objective (denying Banno the power of four Ultimate Evolutions), fails.
- Shoot Medic First: Banno reveals he plans to kill Medic, since without her to heal them the Roidmudes would be no match for him.
- Taking You with Me: 004 staggers into the midst of the Riders, Heart and Medic and detonates himself in order to take them all out.
- The Bad Guy Wins: Even though Brain manages to save Medic at the cost of his own life, Banno has already gathered the energy of four Ultimate Evolution Roidmude and has it secured within the Sigma Circular and was able to escape relatively uninjured while Shinnosuke, Go, Chase, Heart, and Medic were caught in 004's suicide explosion.
- Villainous Breakdown: After Brain successfully foils Banno's plan to kill Medic, Banno begins laughing madly, not even reacting when the Riders begin fighting their way through 004 and the remaining Roidmudes. He wasn't breaking down, he was just pleased that the Sigma Cluster had successfully drawn power from the four Ultimate Evolutions.
- The Roidmude Count: 11The Answer: Brain, as demonstrated by freeing Medic in a life-risking gambit.
