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Phineas and Ferb is an American animated television comedy-musical series. The series follows Phineas Flynn and his English stepbrother Ferb Fletcher on summer vacation. Every day, the boys embark on some grand new scientific project, which annoys their controlling sister, Candace, who frequently tries to reveal their shenanigans to the boys' mother, Linda Flynn-Fletcher, and less frequently to their father, Lawrence Fletcher. The series follows a standard plot system; running gags occur every episode, and the B-Plot almost always features Perry the Platypus working as a spy ("Agent P") for the OWCA (Organization Without a Cool Acronym), to fight an evil scientist named Dr. Heinz Doofenshmirtz. However, Dr. Doofenshmirtz, or Doof as he refers to himself, feels the need to assert his evilness. Sometimes, other villains scoff at his level of evil. The two plots intersect at the end to erase all traces of the boys' project just before Candace can show it to their mother. This usually leaves Candace very frustrated.

The main character's projects are science fiction based as are Dr. Doofenschmirtz's projects: rays, time travel, robots, space travel, aliens, shrink rays, etc.