- “We thought it only fair to warn you that the show you’re about to see may disturb you. It may shock you! It may even horrify you!'”
- ―Phineas Flynn
“The Monster of Phineas-n-Ferbenstein” is the first half of the 22nd episode of Disney Channel original animated television series Phineas and Ferb, originally broadcast on Disney Channel on October 17th, 2008, Toon Disney on May 11, 2008, and Disney XD on October 31, 2012.
“The Monster of Phineas-n-Ferbenstein” was story by Jon Colton Barry and Martin Olson, written and storyboarded by Jon Colton Barry and Michael Diederich, and directed by Zac Moncrief.
A rainy day causes Phineas and Ferb to cancel today’s activities. To pass the time, Grandpa Reg tells the story about one of Ferb’s Victorian ancestors, Ferbgor, who helped a scientist, Dr. Phineastein, creating a platypus monster. While locked in his own building, Doofenshmirtz tells Agent P the story about his ancestor, Jekyll Doofenshmirtz, who made a concoction brewed to turn him into a monster.
On a stage, Phineas and Ferb are wearing tuxedos. Phineas warns the viewers that the following program may scare or even horrify them, to which Ferb follows by spewing a hairball. “You’ve been warned.”, Phineas finishes, before a giant title of the episode smashes into the ground.
Now, with rain pouring down in front of the Flynn-Fletcher house, Phineas is downtrodden and tells Ferb that they can’t do their plan to stand alone in a field with a metal pole. Sitting back down, Phineas queries where Perry is, and cut to him in his lair, Major Monogram appearing in the same fashion as the boys did in the beginning. He tells him that this mission may terrify him, but it probably won’t since he’s been doing this for a while. He then explains that the tarp behind him is because of water damage, and then worries about the time, rushing to go to his cousin’s wedding after telling Perry to stop Doofenshmirtz.
Back at the Flynn-Fletcher house, Grandpa Reg gets reminded of the story of Ferb’s ancestor, Ferbgor. It cuts to a flashback, a gray tinted Victorian-age village, where Ferbgor and Dr. Phineastein collect a spare part from a “semi aquatic mammal.” Then they spot a poster for the “Best Monster Contest”, and Phineastein knows what they’re going to do today. Heading back to the castle, Candace asks if the story could be in color, to which Phineas adds “how about muted color.” Reginald says who’s telling this story, and then gets back to it. He then shows us Constance, their disproving castle governess, who is writing with her quill. She then yells at them to keep it down, and then the boys hide after bringing a giant Platypus monster to life. After laughing maniacally, Phineastein notes that it’s really big. Phineas asks Reg how big, to which he responds by saying “Bigger than a refrigerator, but smaller than a really big refrigerator.”
Also in the present, Perry enters at Doofenshmirtz Evil Incorporated, but is yelled at by Doofenshmirtz to keep it open. It’s too late, so Dr. Doofenshmirtz tells him how the storm made his security system go haywire. To pass the time, he tells Perry the story of his ancestor, Jekyll Doofenshmirtz. In the flashback (looking exactly like Reg’s and in the same place and time), Dr. Jekyll Doofenshmirtz is working on a machine, when his butler, Jameson, tells him the Angry Mob is here (Doofenshmirtz explained that to be truly evil back then, you had to have your own evil mob after you). Since it’s early, the Mob must sit in the lounge. After a little while, Jekyll comes up to them and shows them his newest invention: The Concoction Brew-inator! He uses it to create a cup of some liquid, and then drinks it. To his surprise, instead of a giant evil monster, he becomes a small fairy princess. He tries to get them to stay, but they leave anyway, laughing.
Back with Reg’s story, he goes on to explain that the boys were preparing the monster for the big night. Phineastein demonstrates to Ferbgor that he taught him to “play dead,” and Constance storms down after having enough of the noise. Once down there, Phineastein explains that they’re entering the Monster Contest, and Constance says they don’t even have a monster. The Monster then chatters behind her, and she screams and tells them that she’s telling Mob. She bicycles down to the Mob, and tells them that the boys have made a monster.
Back in Doofenshmirtz’s story, Dr. Jekyll Doofenshmirtz explains to Jameson that the reason he turned into the Fairy Princess is because he accidentally had it on that dial. He fixes it and drinks the right one, becoming a giant Hyde-like monster. He then goes on an evil rampage around the village. At the end of it, he storms over to the boy’s castle, actually “getting the nose” of the Platypus monster, who chases after him angrily. The boys must go after him and get him back. The monster chases him all through the village, as the boys look in places like a cave.
The monster comes over to an Isabella lookalike, while Constance tries to get the Mob to go to Monster Contest where she’s sure the boys are. The boys run into the Isabella lookalike who tells them the monster was at the Monster Contest. The boys then go to the contest. At the contest, Dr. Jekyll Doofenshmirtz escapes from the monster, or so he thinks, but then it sees him and starts pounding him violently. Back in the present, Doofenshmirtz tells Perry he forgets what happens after that, just as the lights come back on. He then tells him that he doesn’t have time to do his evil scheme right now as he has a chiropractor’s appointment, and suggests doing it tomorrow.
In the past, Phineastein and Ferbgor have found The Monster at the contest (who coughs up a wand) just in time for the winner to be announced. The winner is Constance, who has just turned into a Hyde-like monster after accidentally drinking the brew. Phineastein tells the Isabella lookalike that they’re never going to lose the monster again, and Reginald ends the story by saying, “And that is why there are pumpkins.” Confused, Phineas tells him he was just telling them a giant platypus-monster story, to which Reg says that sounds like a good story. Phineas sighs, and as the lights turn on, he asks Ferb if he has anything to say. He responds with, “Platypus monsters are the only monsters to lay eggs.”
The "Too Young" Line
Grandpa Fletcher: And that is why there are pumpkins.
Phineas: Um, Grandpa, you were telling us about a platypus monster.
Seeing the platypus monster in the reflection of the water
Isabella lookalike: What'cha doin'?
Isabella lookalike: La-La-La-La... (Seeing Dr. Phineastein and Ferbgor) What'cha doin'?
Phineastein: We're looking for a giant platypus monster. Have you seen one, by any chance?
Perry's Entrance to Lair
Doofenshmirtz Evil Incorporated!
Phineas: Good evening, ladies and gentlemen. We thought it only fair to warn you that the show you're about to see may disturb you. It may shock you! It may even HORRIFY you! Ferb spits out hairball You've been warned.
Phineas: Looks like a real summer storm! Thunder crashes Well, our plan to stand alone in a field with a metal rod is out.
Major Monogram: Ooh, cheese and crackers! I'm late for my cousins wedding.
Grandpa Fletcher: It's about Ferb's ancestor. He was his great-great-great-great-great-great-great-great-great-great uncle. (lights short out)
Phineastein: I know what we're gonna do today. (laughs maniacally)
Candace: Can't you at least tell a story in color, Grandpa? (castle goes from black-and-white to pink and girly)
Phineas: Perhaps muted color would be better. (castle turns gray-green)
Constance: Will you hold it down? I am trying to use the quill!
Constance: I'm telling mob!
Jekyll Doofenshmirtz: (To Jameson) You know, in hindsight, I question even including a fairy princess setting to begin with. But, you know, live and learn.
Random Villager: I am finally cured of my irrational fear that a giant platypus will see me in my underpants! (Platypus monster walks by) It's even worse then I imagined.
Phineastein: Oh, there you are, Platypus monster.
Jeremiah: (To Constance) I can't remember a day when you looked more beautiful. (Constance turns into monster) Well.... now I can.
- Marks the third appearance of Grandpa and Grandma Fletcher. ("The Flying Fishmonger", "A Hard Day's Knight")
- This is the second Halloween episode, after "One Good Scare Ought to Do It!".
- Isabella, Jeremy, and Roger aren't seen in the episode, but their lookalikes are seen in the back-story.
- Perry's distinctive chattering noise is replaced by a more monster-like growl.
- Dr. Jekyll Doofenshmirtz's butler, Jameson, bears more than a striking resemblance to Heinz Doofenshmirtz's brother, Roger. (Coincidentally, in Spain, the voice actor for Jameson also provides the voice of Roger.)
- While several of the characters in the flashback look exactly alike to the characters that appear in the show, only Ferbgor and Jekyll are said to be related to them.
- Olivia Olson who plays Vanessa Doofenshmirtz makes a secret vocal cameo, singing all of the parts in the episode's song, He's Eviler.
- Mom and Dad do not appear in this episode.
- Phineas and Ferb originally planned to stand in a field with a metal rod, but cancelled it due to the storm. Dr. Phineastein and Ferbgor take over the duty of coming up with the Big Idea: creating a platypus monster.
- There are 2 Fourth wall breaks:
- In the beginning, Phineas and Ferb are in front of a curtain and tells the audience that what they are about to see can scare, or even horrify them.
- Candace asks Reginald to tell the story in color and Phineas in a muted color.
- First episode to have a different title card.
- Ferb's line is a parody of what he first said in the series back in "Rollercoaster".
- Constance's words written in the quill are what her counterpart, Candace, said in Rollercoaster and The Magnificent Few. The line she yells at the boys are also from "Rollercoaster".
- When the platypus monster walks into the Best Monster Contest, among the crowd standing around is the Giant floating baby head that has been seen in "One Good Scare Ought to Do It!", "It's a Mud, Mud, Mud, Mud World", "Out of Toon" and other episodes.
- Episode description from a 2008 Phineas and Ferb press release
- In "The Monster of Phineas-n-Ferbenstein," Grandma and Grandpa Fletcher (voiced by Jane Carr and Malcolm McDowell, respectively) recount the eerie story of Ferb's great great ancestor, Ferbgor. Phineas and Ferb flash back to the Victorian era and learn the story of Dr. Phineastein and his sidekick, Ferbgor, who created their own monster. At the same time, Dr. Doofenshmirtz recounts the story of his great great grandfather, Dr. Jekyll Doofenshmirtz, who created a horrible potion that turns a normal man into a monster.
- This episode is titled "How to Make a Monster" in the UK, according to the UK TV Guide.
- The episode was nominated for an Emmy award in the category "Outstanding Special Class - Short-format Animated Programs". Both nominated shows did not win due to lack of votes 
- This episode appears to take place immediately after or the day after the events of The Flying Fishmonger.
- Right before Grandpa Reg says "This weather isn't fit for man or platypus.", there is a serious animation error on Candace. For at least half a second she has four arms, two by her side and two on the back of Ferb's chair, and she has two torsos, one leading to nothing.
- When Constance enters the door changes from a wide opening to a simple door.
- When Constance drinks the potion, her clothes don't rip when she grows instead they grow with her unlike Dr.Jekyll Doofenshmirtz.
- When Dr. Jekyll Doofenshmirtz drinks the potion at the Monster's Ball the Concoction Brewinator has two dials. One pointing to the evil monster and one pointing to the Fairy Princess.
- Dr. Jekyll Doofenshmirtz in fairy princess form drops his wand when the Platypus Monster grabs him. But, after the Platypus Monster eats him, he coughs out the wand.
- When Dr. Jekyll Doofenshmirtz knocks on Phineastein and Ferbgor's door and the Platypus Monster opens the door the shadow of the monster cannot be seen on the ground. But when Dr. Jekyll Doofenshmirtz runs away the shadow of the Platypus Monster can be seen.
- When Constance was telling the mob that Phinenstein and Ferbgor created the Platypus Monster her eyes were the same as her skin.
- The Isabella lookalike said that she had a PB and J on whole wheat with the platypus monster. However, peanuts are not indigenous to Europe, let alone Drusselstein. Peanuts were also primarily food for livestock until the 1930s.
- Frankenstein - The entire story of Phineastein and Ferbgor is a parody of Frankenstein, including the title. Also, the introduction to the episode is a direct parody of the introduction of the 1930s Universal film. Dr. Phineastein is a parody of Dr. Frankenstein and Ferbgor is a parody of Igor.
- Dr. Jekyll and Mr. Hyde - All of Doofenshmirtz's story was a parody of the famous story, including his ancestor's name.
- Monster Movies - The episode also parodies several classic monster movies, including the ones based on the books mentioned above.
- Alfred Hitchcock Presents, Simpsons: Treehouse of Horrors - At the start of the episode Phineas says that it is a scary episode, introducing this episode in the style of Alfred Hitchcock. This is also near-identical to the presentation before the first four treehouse of horrors episodes, including the dialogue.
- Teen Titans - The sound that the platypus monster makes is very similar to Plasmus, a monster villain from the series. This is because both are voiced by the same voice actor, Dee Bradley Baker.
- The Rocky Horror Picture Show - The spelling of this show's title (Phineas-n-Ferbenstein) may be a reference to the character Dr. Frank-N-Furter from the play and movie.
- The Andrews Sisters - The singers that appear during He's Eviler are reminiscent of the famous close harmony group.
- Young Frankenstein - The start with the text in green and the castle is parody to the start of this movie.
- The Nightmare Before Christmas - One of the monsters bears a striking resemblance to Jack Skellington in his scarecrow costume from the opening of the movie.
- Sleeping Beauty Castle - The castle seen at the beginning bears resemblance to Disney's icon, Sleeping Beauty Castle.
- Vincent Martella as Phineas, Dr. Phineastein
- Ashley Tisdale as Candace, Constance
- Thomas Sangster as Ferb, Ferbgor
- Caroline Rhea as Mom ♦
- Alyson Stoner as Isabella Garcia-Shapiro ♦, Isabella lookalike
- Richard O'Brien as Dad ♦
- Dan Povenmire as Dr. Doofenshmirtz, Jekyll Doofenshmirtz
- Jeff "Swampy" Marsh as Major Monogram, Additional Voices
- Dee Bradley Baker as Perry, Platypus monster, Additional Voices
- Mitchel Musso as Jeremy ♦, Jeremiah
- Jane Carr as Grandma Fletcher, Additional Voices
- Malcolm McDowell as Grandpa Fletcher, Angry Mobster, Additional Voices
- Joel Grey as Beppo ♦
- Jennifer Grey as Dr. Gevaarlijk ♦
- Greg Ellis as Jameson, Additional Voices
- Alec Holden as Django ♦
- Additional voices: Jeff Bennett, Olivia Olson, Candi Milo
- ♦ designates a character that did not appear in this episode
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