. . "Doofenshmirtz and Perry's relationship"@en . . "Doofenshmirtz and Perry have a very strange relationship. They claim to be enemies, but they are relatively civil to one another more often than one would think they should be."@en . . . "Doofenshmirtz and Perry have a very strange relationship. They claim to be enemies, but they are relatively civil to one another more often than one would think they should be."@en . .