AAH, PERRY the PLATYPUS! I suppose you’re wondering about my evil plan. Well, you see, when I was a child in Gimulshtump, I was quarantined for several months, 

phineas: we turned ourselves into holograms so that we can still hang out with our friends while social distancing. later candace! *he and ferb fade out of view* 

candace: mOoOoOoOoOoOoOoOoOoOoM!!!!!!!!! 

Okay, but the thing with Perry and Doof becomes a lot funnier when you remember that Perry, being a platypus, is immune to the virus.

So imagine Doof monologuing over Zoom, secure in the knowledge that Perry the Platypus can’t possibly thwart him over a video call, when Perry disappears from the frame. As he ponders where his nemesis could have gone, Perry plummets onto Doof’s balcony and socks him one in the jaw.

Doof: What?! Perry the Platypus?! What are you doing? You shouldn’t be out here! There’s a quarantine going on, in case you haven’t noticed!

Perry: *platypus noise*

Doof: Oh, right, you’re a platypus, and this is a human virus, so… You know, I don’t really know how I forgot that.

Perry makes sure to do a full decontamination on his way home, to make sure Phineas and Ferb don’t get any potential virus particles on them after petting him and picking him up.

at one point while doof and perry are fighting doof goes “wait! i forget to put on my mask” and perry stops punching him to let him put on his mask then they just go back to fightung

The spirit of the show really does live on