Which character appears in every episode of Phineas and Ferb?

Which character appears in every episode of Phineas and Ferb?

The answer is Perry

In the animated television series "Phineas and Ferb," Perry, also known as "Perry the Platypus," is a secret agent with the alias "Agent P." He is a semi-aquatic mammal known as a platypus, and he leads a double life. On one side, he is the beloved pet of Phineas and Ferb, two stepbrothers, who are unaware of his secret identity. On the other side, Perry is a skilled secret agent working for a spy organization called the O.W.C.A. (Organization Without a Cool Acronym).

Perry's main mission is to thwart the evil plans of the bumbling but persistent Dr. Heinz Doofenshmirtz, who is completely unaware that Perry and his pet alter ego are one and the same. Despite their ongoing battles, there is a strange sort of camaraderie between Perry and Dr. Doofenshmirtz, and they occasionally find themselves in situations where they must work together.