Back at Pantheon, authorities are removing the rubble and taking everything that will be introduced as evidence in their case against the executive heads. Det. Watkins is heading up the investigation without Det. Olyphant who was supposed to talk to Cade. He speaks to the Myers twins who were there previously as Kamen Rider Double.
"So, I'm glad you're here. I couldn't get Olyphant here. Looks like whoever attacked this place did us a favor. We got everything from files, documents, and even equipment. We have enough to prosecute them. Listen, we need you to go inside and find anything else that has eluded us. You know, ever since that attack, I couldn't help but wonder whether Pantheon was up to something."
"I know how you feel. We'll get on that. Just make sure that no one else goes in."
"Alright. Get back to us when you can. We don't want any stone left unturned."
"Yeah, I got that. Come on Ozzie, let's go."
The twins enter the former headquarters of Pantheon and look around the facility. They turn on their flash lights and find more documents and files that were left behind after the attack. They enter the main experimental room where the monsters were killed in some experiment that they discovered much earlier. Suddenly, they hear a noise up ahead and they go to investigate.
"Hey Rowan. Look. You're not gonna believe this but check this out."
A portal leading to the forest appears in an adjacent room. Suddenly, a group of Dragon Gorven appear and behind them one of the secondary overlords appears.
"Well, well, looks like we have some troublemakers here. Let's take care of them."
"Alright Ozzie, I know this is crazy, but let's fight as two Riders instead of one."
"I'm up for it."
"Cyclone!"
"Joker!"
"Transform!"
"Transform!"
The twins transform into their separate halves and fight the Gorven. Fury attacks Cyclone, but he uses his Cyclone kick to force him back. Joker then accompanies Cyclone and attacks using his Joker Shadow Fist to defeat him. Fury gets up and pulls out his sword.
"Damn it! We'll have to change now!"
"Right!"
"Metal!"
"Fang!"
Fang and Metal use their weapons to counter Fury, but they are outmatched by his superior swordsmanship. Then, Accel appears from the background and attacks them via his Trial form. He activates his Trial Timer and swiftly defeats all the Gorven. They explode and Fury is forced to retreat, but not before more Gorven rush to them.
"Oh great, they're coming!"
"We can't let them escape to the city!"
"Trigger!"
"Luna!"
They both attack the Gorven to prevent them from leaving the facility. Accel also helps to ensure that the people are kept safe from the Gorven. But then Vice appears from the background and uses his power to force the three Riders back.
"Looks like we have ourselves a new home! My Gorven, let's make use of this place! Kill them!"
"Come on guys, we can't let them escape!"
Accel transforms into his Cycle Form and the duo ride their Double Cycle to collapse the ceiling behind them, forcing the monsters back. They escape to their office and contact the other Riders and Rangers to warn them of the oncoming invasion.
"Guys, if you're hearing this, I have a warning for you. The monsters we fought at the forest are already here in the city. We have to warn Cade now!"
Meanwhile, Luke and Sarah head to the antique shop with a visibly worried Lena who begins to cry at the sight of Cade.
"Oh my god! What happened to him? How did you let this happen?"
"Ma'am, listen, you need to listen. Your son is deep into something he can't get out of."
Lena continues to cry and focuses her rage on Luke.
"Luke, what do you mean!? Is he a criminal or something? He's my little baby! He couldn't do anything like that!"
"Ma'am. Your son was involved in the attack at Pantheon. And I was too. But he was attacked by a monster that sneaked up on us. I barely survived but your son is not responding to any of my attempts to revive him."
"You mean he was involved? Jane get over here! Your brother is dead!"
"Dead? Nooooooooo! I can't believe this!"
Lena and Jane cry uncontrollably while Luke and Sarah place his lifeless body on the couch. Luke gets some water and a rag to clean his bloodied corpse. Sarah puts a cover over him to stop the bleeding. Afterward she stands worried that he might be dead. She begins to daydream about him smiling at her and holding hands. She then cries as she kisses his forehead.
"Cade, I'm so sorry! Cade, if you can hear me, I think you're cute! You won my heart the minute I met you. You have my heart. Please, get up! I beg of you!"
Back at the forest, Flynn and the other Riders find their way out of the forest, but end up seeing the Gorven escaping into Pantheon. They follow them to the back entrance of the facility and are shocked to discover that the entire facility has been taken over by them.
"Oh no, we have to warn the others."
"How are we supposed to stop them now? They might leave the city."
"You're right. We need to call the other Riders again."
Before they can call the Riders, they are approached by Dragon Slayer, Duke, Viking and Spike.
"Looks like we have to deal with these guys too."
"Alright, let's do this!"
The Riders charge toward the dark Riders and manage to defeat them. Suddenly, Beast joins in the fray on his Chimera Cycle and takes down Dragon Slayer. Spike unleashes an energy Durian towards Knuckle, but he uses his Walnut Fists to throw it back at him. Beast then gets his Toro Ring and summons his Toro Form.
"Toro!"
"Six!"
"Toro Saber Strike!"
A herd of bulls attack the dark Riders and they are severely wounded. They are forced to power down, including Spike who is revealed to be Detective Olyphant. Flynn is shocked to see the detective as he had seen him earlier.
"Well, it looks like we have someone who worked with the police department. Hey guys. Let's handcuff these guys and then warn the others about the upcoming invasion."
"Got it."
The Double Riders and Accel show up to assess the situation.
"Hey guys, look who we have here. A cop who was working with these guys."
"I'm guessing you're that detective that was supposed to talk to Cade. Well, looks like your partner is going to be disappointed. Watkins, we have your partner detained here."
"What? Are you kidding me?"
"Nope, he was working alongside these guys."
"Well, thanks for the heads up. I'm on my way."
Back at the forest, Julian wakes up and discovers that he was placed on a canopy in a hut. He tries to get up but is pushed back by a woman who gives him medicine for him to eat.
"Here, take this."
"Thank you. Where am I?"
"You are at the forest. Ventricus found you and now you are here. Just rest and you will be alright."
"Okay, thank you."