Ah Perry the Platypus, it seems you have been shot with my Cringe-inator! Oh but what’s this? It seems you haven’t changed at all, it must be because you are already very cringe!
Sadly, this one time they asked where Perry was and he just never came back. He didn't go on a wacky and silly adventure to thwart Doofenshmirtz that serendipitously ended up covering Phineas and Ferb's activities right as Candace is about to bust them to their mother... he just got hit by a truck, his entrails smeared across the suburban street.