Phineas, Ferb, Perry and their Friends are singing Summer Belongs to You
Heartless is attacking Danville
Phineas: Oh no! Heartless!
Ferb: Their Dark Creatures that wants Hearts.
Perry: It looks like they're back.
Baljeet: What can we do now?
Buford: We'll think of something.
They need to do something and then Ryan and his friends are here
Ryan: Hey, you guy.
Phineas: Ryan! You're here!
Ryan: Yeah, What's going on?
Phineas: Heartless, they're taking over the city.
Sora: Oh boy.
Isabella: It is... Can you help us?
Ryan: Sure, we help.
They went off and they found Doofensmirtz is the one behind this
Doofensmirtz: Look who's here.
Phinsas: Dr Doofensmirtz.
Doofensmirtz: I see, you find out that I have those Heartless take over the city.
Ryan: We can't let that happen!
Doofensmirtz: Okay! Fight me!
They are fighting him and they Defeated him
Phineas: Phew. We did it. And Ferb, I know what we're gonna do today.
Then the Blueprint is glowing
Ryan and Sora unlocked a New Gateway
Phineas: What was that?
Ryan: A Gateway has been open, we have to go now.
Baljeet: Come back again?
Sora: Sure, we will. Promise.
Ferb: Next Time... be here for us.
They left this world