A truck pulls up in front of the Flynn-Fletcher house. A guy comes out, claiming to be Steve's true owner. He takes Steve back, and Phineas and Ferb, along with their friends, go on a journey to find him. Unknown to them, Steve has recently become an agent in the OWCA, and Perry is also on a mission to retrieve Steve. Doofenshmirtz helps, While Candace and her friends (even an enemy) track them to bust them.