|“||I happen to be throwing the biggest, baddest, Halloweeniest bash ever!||”|
When Vanessa learns that Doofenshmirtz has inherited a Drusselsteinian castle right next door to her she seizes the opportunity to throw the biggest Halloween bash ever. The whole town is there, including Phineas and Ferb, who act as the event's party planners and DJs. Meanwhile, Doofenshmirtz enlists Perry to help him find a large, hidden treasure that his Great Aunt has placed somewhere within the castle.
The story opens at the Flynn-Fletcher House, where Lawrence is dressed in a gorilla costume making a jack o'lantern. Phineas tells Dad that he, Candace and Ferb are off to a Halloween party in a castle where they will work. Linda arrives in a nurse outfit, and Lawrence puts the gorilla head on, mock-scaring Mom in the process.
Meanwhile, Agent P jumps into his lair via a pile of leaves quickly cleared by a leaf blower. In his lair decorated for the holiday, Major Monogram, dressed as Carmen Miranda, informs Perry that he has to work tonight keeping an eye out for Doofenshmirtz and Carl enters in a variation of the outfit. After saying that's what he looks like in the costume, Monogram tells Carl he can have it, and will look into getting another costume.
Vanessa is on the phone with the Major's son, Monty, doing a bit of freelance work at a black-tie party, telling him about the party she is throwing in a castle that her dad inherited via a split screen. After saying she'll dress as a vampire queen, Monty says he'll be dressed as The Scarlet Pimpernel. After hanging up, he tells Agent M that he's alone from there.
At the Doofenshmirtz Evil Incorporated building, Doofenshmirtz gives out candy to trick-or-treaters, including Perry, who is dressed as a ghost. After Perry twists Doof's arm, the doctor says he has no -inator, but inherited a castle from his Great Aunt Henrietta Hawkenschpit, who liked Heinz more than Roger. Inside that castle is a major treasure, and suggests that Perry join him searching for the treasure on a map with clues.
At the castle, next to the D.E.I. building, Vanessa welcomes guests, including Lacie, who really isn't in a costume, and Candace, who is dressed like Vanessa, as is Stacy, who says she'll change her costume.
First verse of Haunted by You.
I know what we're gonna do today
The "Too Young" Line
Sings Haunted by You.
Hey, where's Perry?
Oh, there you are, Perry
Perry's entrance to his lair
Perry jumps into a pile of leaves, and the leaves are blown away, leaving no traces of Perry.
None, but the jingle can be heard when a group of trick-or-treaters rings Doofenshmirtz's doorbell.
Vanessa: This is a big night for me, my boyfriend's coming. Oh, here he is right now.
(Jeremy, dressed as a Scarlet Pimpernel enters.)
Phineas: Hey, look at you! You're Isabellarella.
Isabella: If I lose a slipper tonight, you know where to find me.
Vanessa: Monty should've been here by now. (Another Scarlet Pimpernel approaches her.) Finally. Wait, who are you?
Scarlet Pimpernel 1: I'm the Scarlet Pimpernel.
Major Monogram: Monty, is that you?! With the daughter of my sworn enemy?! It can't be!! (Walks up to the Pimpernel next to Vanessa.) Alright, Monty, you've got a lot of explaining to—
Stacy: Oh, hello, Mr. Water and Power Guy.
- Fifth episode to take place outside of summer. ("Phineas and Ferb Christmas Vacation!", "That's the Spirit", "For Your Ice Only", "Happy New Year!")
- Fourth time Vanessa crosses paths with Phineas ("Finding Mary McGuffin", "Phineas and Ferb Summer Belongs to You!" "Excaliferb") and the seventh time she crosses paths with Ferb. ("I Scream, You Scream","The Chronicles of Meap", "Vanessassary Roughness", "Finding Mary McGuffin", "Phineas and Ferb Summer Belongs to You" "Excaliferb'")
- The fifth Halloween-themed episode ("One Good Scare Ought to Do It!", "The Monster of Phineas-n-Ferbenstein", "That's the Spirit", "The Curse of Candace") and the second one to actually take place on Halloween. ("That's the Spirit")
- Tenth episode that has a one-word title. ("Rollercoaster", "S'Winter", "Atlantis", "Canderemy, "Bullseye!, "Excaliferb", "Doofapus", "Blackout!", "Sidetracked")
- Second episode to not take place on a seasonal break from school. ("That's the Spirit")
- Second time Major Monogram dresses in drag. ("The Beak")
- Second time the theme song was rethemed for Halloween. ("That's the Spirit")
- The remix is a medley of "S.I.M.P. (Squirrels In My Pants)", "Ain't Got Rhythm", "Spa Day" and "I'm Lindana and I Wanna Have Fun!".
- Ferb wears his dapper singer costume from "De Plane! De Plane!".
- Vanessa dresses as a vampire queen for Halloween. Coincidentally, Vanessa's voice actress, Olivia Olson, also gives voice to Marceline the Vampire Queen on Adventure Time.
- This marks the first time that Vanessa shares scenes with Stacy, and second time she does so with Jeremy. ("Lizard Whisperer")
- Doofenshmirtz says a variation of "A platypus?!...PERRY THE PLATYPUS!?!?!" again. ("Lawn Gnome Beach Party of Terror", "Does This Duckbill Make Me Look Fat?", "Attack of the 50 Foot Sister", "The Lemonade Stand", "Hip Hip Parade", "The Mom Attractor")
- Second time Candace asks someone, "Et tu?" after finding out they are involved in one of Phineas and Ferb's big and bustable ideas. ("Crack That Whip")
- Fifth appearance of Monty and fifth episode involving Monty and Vanessa's relationship ("Minor Monogram", "Sipping with the Enemy", "My Sweet Ride", "Thanks But No Thanks")
- The O.W.C.A. HQ are decorated in the same way as they were in "That's the Spirit".
- Ferb doesn't speak in this episode, but he does sing the song. ("Flop Starz", "Tip of the Day", "Oh, There You Are, Perry", "The Baljeatles").
- Isabella wears her hair up again. ("Jerk De Soleil", "My Fair Goalie", "Troy Story").
- Second time Isabella wears a ballgown ("Gaming the System").
- In broadcast order, this was the 200th episode of Phineas and Ferb.
- October 11, 2013 - Family Channel, Canada
- The episode title is misspelled as "Druselsteinoween" with one "s".
- Once again, Isabella is drawn with eyebrows.
- Stacy recognizes Major Monogram as the "water and power guy". ("Happy Birthday, Isabella")
- Doofenshmirtz names the alligator "Susan". ("The Ballad of Badbeard")
- The Scarlet Pimpernel - A reference from the play, book, and movie is made in the episode multiple times.
- Carmen Miranda - Was a 1940's Brazilian move star best known for wearing a hat while performing made of fruit.
- Harry Potter - One of the trick-or-treaters at Doofenshmirtz's apartment is misidentified as a "class dunce with a fake scar."
- Lady Gaga - Another one of the trick-or-treaters is misidentified as the Princess of Meatland. It's a reference to the performer born Stephanie Germanotta's meat dress from the 2010 MTV Video Music Awards.
- Angry Birds - A third trick-or-treater is misidentified as "an upset rooster head", which sounds like the general appearance of the Angry Birds characters.
- The Shining - A pair of twins egress from the elevator akin to those from the Stephen King novel and movie adaptation.
- Ali Baba Bunny - Doofenshmirtz does Daffy's "I'm rich! I'm wealthy! I'm comfortably well off!" spiel.
- Windsor Castle - Buford calls Irving "Windsor".
- Julius Caesar - Candace's "Et Tu?" line to Vanessa comes from the Shakespeare play.
- Cinderella - This is Isabella's costume. Phineas refers to her as "Isabellarella", and Isabella tries, in vain, to "lose" a glass slipper to get closer to Phineas.
- Adventure Time - As stated in the Production Information, Vanessa dresses as an vampire queen. Olivia Olson, her voice actress, also voices Marcelline the Vampire Queen on this series.
- Vincent Martella as Phineas, Additional Voices
- Ashley Tisdale as Candace
- Thomas Sangster as Ferb (no lines)
- Danny Jacob as Ferb's singing voice (uncredited)
- Caroline Rhea as Mom, Additional Voices
- Richard O'Brien as Dad
- Dan Povenmire as Dr. Doofenshmirtz, Additional Voices
- Jeff "Swampy" Marsh as Major Monogram, Additional Voices
- Dee Bradley Baker as Perry, Additional Voices
- Tyler Mann as Carl
- John Viener as Norm ♦
- Maulik Pancholy as Baljeet
- Bobby Gaylor as Buford
- Alyson Stoner as Isabella
- Kelly Hu as Stacy, Additional Voices
- Mitchel Musso as Jeremy
- Olivia Olson as Vanessa, Additional Voices
- Seth Green as Monty Monogram, Additional Voices
- Jack McBrayer as Irving, Additional Voices
- Benita Scheckel as Lacie
- Additional voices: Brian Phelps, Jill Whelan, Lucas Grabeel, Michaela Zee, Rob Morrow, Todd Stashwick
- ♦ designates a character that did not appear in this episode
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