Phineas and Ferb

Phineas and Ferb follows two suburban step-brothers whose imagination brings them to create large and almost impossible plans and inventions during their summer vacation which eventually embroils their snoopy sister. The series follows a particular plot system, in which running gags occur every episode and the B-Plot always consists of the boys' pet platypus (Perry) living life as a secret agent (Agent P), fighting an evil Druselsteinian scientist named Heinz Doofenshmirtz.