With school out for summer, stepbrothers Phineas and Ferb are determined to make every day an exciting adventure. They channel their creativity into various inventive projects, transforming their backyard into a hub of fun and innovation. However, their elaborate schemes often frustrate their sister Candace, who is on a relentless mission to expose their activities to their mother. Despite Candace's best efforts, Phineas and Ferb always manage to cover their tracks just in time. Meanwhile, their pet platypus Perry secretly operates as Agent P, constantly thwarting the evil plans of Dr. Doofenshmirtz to take over the Tri-State Area.