And I know what your thinking. "But everyone knows Drusselstein is spelled with 2 S's not 1. What the hell?" I know, man. It's bugged me for years to.
And yes, it is Halloween in this one, as this is the fifth episode in the series to push events out of the Summer period. Which means we see the Flynn family at Halloween. Mom and dad are prepping for Halloween. Dad is working on a jack o'lantern, a while also finalizing his and Mom's costumes. Giant ape and nurse. The a parents plan to have fun while the kids all go out for the night.
And, yeah, the parent's plan is apparently to scare kids into dropping candy they can then scoop up.
Meanwhile, Perry is sent to check on Dr. Doofenshmirtz, to be sure he's not up to anything.
Turns out he's handing out candy and getting ready for a more run of the mill adventure. A castle that was plopped into the city is from his aunt, who left it to him in her will. And now it's beside his building.
But Doof has also learned that his aunt left a massive fortune hidden in the castle, along with clues he can follow. So he asks Perry to hang out with him, and help him get the treasure.
So they go on search of the castle, being taken high and low by clues.
Finally, the bags of money are revealed. Doof is thrilled. Then all the officials start arriving. Fees for the castle. Fines for having a moat in the downtown area. On and on. By then the money is gone, and the castle will have to go.
At the same time, everyone is heading out to the biggest party in town. The mother of all parties, in a real old castle (i.e. Castle Doof), recently dropped down in the middle of the city.
The party is being put on by Vanessa Doofenshmirtz, daughter of Dr. Doofenshmirtz and all around cool kid. It will be a costumed event. So she's decided to invite her secret boyfriend. Monty, son of the head of OWCA, Major Monogram. Neither dad would like to see their kids with the kid of the other. But in costumes they can be together in public.
So Vanessa tells him she'll be dressed as the Vampire Queen (which is funny as the voice actor for Vanessa also does the voice of Marceline the Vampire Queen on Adventure Time). Monty says he plans to dress as the Scarlet Pimpernel. Vanessa has to admit she has no idea what that is.
Trouble arises at the party. Vanessa sees that Phineas and Ferb's sister Candace has also come as the Vampire Queen.
And then Candance's best friend Stacie also shows up in the same costume. But she leaves to change.
Then Candance's boyfriend shows up dressed as the Scarlet Pimpernel.
And then Stacie shows up dressed as the Pimpernel. And she just gives up.
In fact the party is lousy with Vampire Queens and Scarlet Pimpernels. Who would have thought it?
Phineas and Ferb are also at the party. They were hired by Vanessa to pull off the party: decorating, handling music, organizing food and drink. Ferb even gets to croon.
The party proves to go well. The music is good. Monty and Vanessa finally meet up and dance.
Even Isabella and Phineas have some fun.
But Major Monogram happens to stop by the party and think he's spotted his son.
But with a quick change, Monogram thinks it's actually Stacie (who happens to know who Monogram really is)
So Monty can swing away,
But everyone had a good time, except Doof.
This is a fun little break from the standard Phineas and Ferb story. The pair spend most of the story in the background. Perry and Doof are teamed up. And there's no actual adventure or trouble for any other characters, except what's drawn from A Comedy of Errors.
It's just they through a Halloween party, and Dooftenshmirtz tries to find some treasure. Some light fun this Halloween.