User blog comment:FerbFlecher151/Season 4 - First Impressions/@comment-1856476-20121208104433/@comment-3477287-20121208105152

"Perry the Platypus, aka Agent P, has much bigger problems than just Dr. Doofenshmirtz. He teams up with a former partner to stop a hijacked train and comes face to face with an Australian platypus hunter set out on destroying him!"

I agree. Season 4 seems really promising.