This is how our heroes revisit Danville in Ryan's Quest 2.
They are here in Danville and they saw all the Animals taken away except Perry
Phineas: Leave Perry alone!
They are chasing from the Robots
Phineas: Ryan! Sora! Help us!
They are fighting them and they defeated them
Ryan: That was close.
Phineas: Thanks. Those Robots wants get all the Animal Agents.
Isabella: And it took Pinky away.
Baljeet: And my Turtle.
Sora: We have to find them. Let's go!
They went of and they find out Doofensmirtz is the one who took them
Doofensmirtz: Hey, kids.
Isabella: Let Pinky and the Others go!
Doofensmirtz: Nope, take this!
They are fighting him and they defeated him
Doofensmirtz: Curse you, Ryan the Techno-organic boy! [to Sora] And you too, Keyblade Boy!
Phineas: Well, at least we save the Animal Agents.
Ryan: Yeah. We have to go.
Ferb: Ryan? I hope you and your new friend find Cody and his friend. Good luck.
They left this World