Before Kamen Riders Strike and Torque can engage in their fight, Decode accidentally arrives through the portal.
"What the hell?"
"Hey buddy, get out of the way. This is our fight."
"Oh come on, not this again."
"So, what are you supposed to be?"
"I'm just passing by."
"So go pass somewhere else."
"I don't even know where I am."
"Well, since you're standing there like an idiot I guess we both have to take you down."
"Hey Strike, let's postpone our fight for now."
"Fine. I don't like people getting in my way."
"Well, if you guys really want to fight me that badly here we go."
Decode fights both Strike and Torque in a two on one sword fight before Dragon Knight and Wing Knight show up.
"Oh great, four on one now this is unfair."
"What the hell is going on here? Len who is this guy?"
"I don't know, but I'm not going to wait to find out."
Dragon Knight and Wing Knight charge towards Decode before they are attacked from behind by Kuuga and Dead End.
"So, you thought you could leave without us?"
"Kuuga, how did you get here?"
"I followed a portal and ended up with these guys."
"Well, don't just stand there."
The trio work together to fight the two Riders while Strike and Torque continue their battle.
"Well, time to fight bat with bat."
"Kamen Rider, Kiva!"
"What the hell? How did you do that?"
"Don't ask. I'm just passing by."
Decode charges towards Wing Knight who tries to defeat him, but he manages to counter his attacks and even throws him back.
"Well, let's see you handle this."
"Form Rider, Lycan!"
Decode slashes Wing Knight with his Lycan sword and Dead End fights off Dragon Knight by summoning another Kamen Rider.
"Kamen Rider, Stinger!"
"What the hell am I doing here? Dead End, seriously?"
"Just trust me on this. Fight him and you can return home."
"Fine."
Stinger attacks Dragon Knight while Decode in his Kiva Lycan form pulls out another form card to transform with.
"Form Rider, Bane!"
Wing Knight tries to chase Decode but he bashes him with his Bane Hammer. Suddenly, Sting appears after venting Torque to fight off Decode. They pull out their cards to fight him off.
"Final Vent!"
"Final Vent!"
"Not this time!"
"Final Attack Rider, Kiva!"
He narrowly avoids their final vent attacks as Kuuga performs his Rider Kick to aid Decode which forces the two Riders to power down. Dead End also defeats Dragon Knight and as promised, Stinger disappears back to his world.
"So, these are Kamen Riders? Not very impressive. Alright it's time for us to talk."
"Who are you guys?
"We're just passing by. But since you're here now it seems that your world is in danger."
"What are you talking about?"
"Someone here is trying to destroy you. And he looks like this."
He shows them a holographic image of a Ventarran Rider that had recently appeared on their world.
"What, we've never seen that Rider before. Who is that?"
"That my friends is Kamen Rider Mako. He was recruited by Shocker to force you guys to vent each other and yet you decided to vent Torque. What are you stupid?"
"So why does he want us to vent each other?"
"So that he can have all the Advent Cards, kill all the Ventaran Riders and of course become the Advent Master."
"How do you know all this?"
"It's easy. I travel through dimensions like Decode. Kuuga just joined us for the ride. Now we have to find the other Riders and warn them too."
"Wait, how can we trust you? You're not from around here and you just told us that you're from another dimension. How do we trust you?"
"Simple, just follow us and you'll get the answers you seek."
And with that, James, Kit, and Len follow Shane, Leo, Jake and Laina while they try to find the other Kamen Riders.