Rollercoaster: Chapter 1

As Promised Hira, Hiroko, Cody, Diego, Hiro, Damrie, Their Parents And Miroko Are Spending Summer In Danville. But Cody Is Concerned About Hiro's Relationship With Damrie As He And Damrie Hates Each Other. While Hira, Cody, Diego, Hiroko, Damrie, Phineas And Ferb Are Building Something Fun And While Candace With Miroko As Her Partner Tries To Bust Her Brothers And Their Friends, Hiro And Parry Worked Together With Hiro's Pokémons To Defeat Dr. Doofenshmirtz From Taking Over Tri-State Area. Along The Way Hiro Learns More Of Their Relationship With Damrie During The Battle.

This Is Before Hiro's Adventures In Cars And The Spencer Reland Story Arc.