Shinnosuke arrives at the Special Investigation Unit with an injured neck, as he confirms his theory that the five homicides are linked to the Roidmudes. However, that still leaves the question of why all five cases occurred at the same time. At the Drive Pit, Rinna is removing Medic's control on the Shift Cars, which are currently out of commission. Mr. Belt recalls Drive's first fight as Type Formula, whose power saved Kiriko and the Shift Cars from destruction. However, its Full Throttle finisher placed a strain on Shinnosuke's neck. Shinnosuke also thanked Go for passing Shift Dead Heat to him in the nick of time. Go, still not feeling at ease about Chase, leaves. Mr. Belt figures that they need to find a way to finish off the battle as Type Formula without any self-inflicting injury. Rinna states that she has made a new weapon that can handle the issue, but she is still stuck on the finishing touches. She is then reminded of the gift she received from Prof. Harley, believing that he left a hint inside. The gift turns out to be the Professor's home-made Harley Pies.
At a medical inspector's office in eastern Kanto, dead bodies begin crawling out of their beds.
Back at the Unit, five men appear in the office. Jun thinks that they want to get a driver's licence, but Kyu recognises them as the victims from the five homicides. Go and Kiriko try to fend off the victims, but Kiriko gets knocked out and carried away by two of them. As a victim attacks Jun, he throws all sorts of things at the victim, including Shift Wild, allowing Mr. Belt to sense the danger. The Shift Car penetrates the victim's body, causing it to burn and disintegrate into dust. Go chases another victim and throws his Signal Bike at him, doing the same thing to its body as well. Shinnosuke arrives at the Unit's office and inspects the scene. Mr Belt deduces that the bodies were copies created by Medic, which was how forensics believed that they died at the same time. Rinna is still fretting over her creation at the Drive Pit.
Beneath a highway, one of the "victims" passes Kiriko to Chase, who then disintegrates all the remaining three victims. He is stopped by Go, who transforms into Mach. As Mach asks Chase how could he toy with human life, it undoes part of Chase's reprogramming back to its original state, causing Chase to put down Kiriko on the ground and step back in shock. As a confused Chase wonders what he has done, Medic appears and renders him unconscious. She sends her Reapers after Mach, who fights them as Deadheat Mach. After the fight, he collapses in exhaustion. He wakes up to find Shinnosuke and Kiriko, and tells Shinnosuke that Chase wants to fight him fair and square.
Brain finds himself cornered by Chase at the Roidmudes' base. Medic exposes Brain's action of weakening Chase's firewall, as she reveals that she has increased Chase's destructive impulses to their highest level, allowing him to kill anyone that she tells him to. Brain begs Medic to forgive him, while Medic sends Chase after Drive. Medic reveals that she only let Brain live only out of consideration for Heart. Brain searches for his handkerchief, only to find that it has been taken by Medic, who throws it into the fireplace, causing him to suffer a nervous breakdown.
Chase is on a killing spree, demanding to find Drive. Shinnosuke transforms into Drive and fights him, but is overpowered by Chase's Super Heavy Acceleration. Even with Type Dead Heat, Drive cannot match up to Chase's high speed. As Chase is about finish Drive off with Triple Tune, Rinna's new weapon appears and disrupts his attack, delivering Shift Formula to Drive. Drive dubs the new weapon the "Trailer-Hou". With the Trailer-Hou, Drive easily overpowers Chase and defeats him, resulting in his core being destroyed. The Ride Chaser is left at the Drive Pit's possession.
As Rinna, Kyu, and Jun clean up the mess at the Unit's office, Kyu chides Shinnosuke for playing around with his new "toys". Jun stops Kyu from picking on the Shift Cars, dubbing them the Unit's guardian spirits.
Meanwhile, on a rainy night, Kiriko finds Chase in a corner struggling with his injuries, much to her shock.
- Artificial Zombie: Averted. The "victims" from the previous episode are actually duplicates created by Medic and animated by Chase to raid the Special Unit HQ and kidnap Kiriko.
- Beam-O-War: How Drive Type Formula and Mashin Chaser finish their duel. Drive wins by a longshot.
- Duel to the Death: Chase challenges Shinnosuke to one final showdown.
- Eviler than Thou: When Medic figures out that Brain tampered with Chase, they pay him a visit. She quickly reminds of his place in the Roidmude food chain.
- Foreshadowing: Shinnosuke's lamenting of Chase's death can be interpreted as a very subtle hint of what's to come.Shinnosuke: Chase, I can't imagine how much better things would've gone if you were on our side...
- In Medias Res: The episode starts after the heroes got out of the danger in the previous episode, and then tells us how they did it.
- No Body Left Behind: The zombies turn into dust when attacked with a Shift Car or Signal Bike.
- No One Could Survive That!: Chase manages to survive his duel with Drive, even though there was a double explosion (indicating the destruction of a Core).
- Oh, Crap!: The Chief makes an epic one when he notices that the people who barged in are the supposed dead victims.
- Touch of the Monster: Chase carries this way an unconscious Kiriko.
- You Have Outlived Your Usefulness: Once they bring him Kiriko, Chase destroys the remaining zombies.
- The Roidmude Count: 73The Answer: By making use of the Trailer Cannon.
