The Dreambender King of The Dreambender War series travels into the world of Phineas and Ferb and ends up helping the boys save Perry the Platypus from the evil interdimentional dictator Nightmare; Perry and Heinz Doofenshmirtz must work together to escape Nightmare's clutches.
The "Too Young" Line
Perry's entrance to his lair
The Dreambender War Book Four: During the story, an incident known as the "Girl Scout Incident" is a running gag. The incident is finally seen in this episode.