User blog comment:PerrythePlatypus/what happens in season 3.... You decide!!/@comment-2240628-20110219055803

Perry's personality gets split into two. One side is his mindless pet persona and the other is his secret agent persona. Phineas and Ferb start to wonder why he didn't disappear on that day. Agent P starts working as a full time agent and stays at DEI watching Doof's every move--from his evil schemes to brushing his teeth, going to bed, or even taking a bath--thereby making Doof annoyed and irritated