The Monster of Phineas-n-Ferbenstein

The Monster of Phineas-n-Ferbenstein is the episode where the boys learn about one of Ferb's Victorian ancestors, who helped a scientist create a monster, while Doofenshmirtz tells a story to Perry about his ancestor, who became a monster. It aired on October 17th, 2008, on Disney Channel, and was the second Halloween episode.

Summary
The episode opens on a stage, where 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 hacking up a fur ball. "You've been warned," Phineas finishes, before a giant title of the episode smashes into the ground.

Now, the episode really starts, 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, 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 from water damage, and then frenzies over the time, rushing to go to his cousins 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 knowns what they're going to do today. Heading back to the castle, Candace breaks the fourth wall and 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, the two's disproving castle governess, who is writing on her quill. She then yells at them to keep it down, and we then see the boys bringing alive a giant platypus monster hide. After laughing maniacally, Phineastein notes that it's really big. Phineas asks Reg how big, to which he responds by saying "Bigger then a refrigerator, but smaller than a really big refrigerator."

Also in the present, Perry enters Doofenshmirtz Evil Incorporated, but is yelled at by Doofenshmirtz to keep it open. It's too late, so Dr. D tells him how the storm made his security system go haywire. To pass 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), Jekyll 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 Brewinator! 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 "[She's] telling Mob". She bicycles down to the Mob, telling them in the same fashion as Candace does with Mom that the boys have made a monster.

Back in Doofenshmirtz's story, Jekyll 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 at. 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, Jekyll has escaped from the monster, 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, since 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. And the winner is Constance, who has just turned into a Hyde after accidentally drinking the drink. The boys tell Isabella-lookalike that they're never going to lose the monster again, and Reginald ends the story finally 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: "Platypus monsters are the only monsters to lay eggs."

Songs

 * He's Eviler

The "Too Young" Line
None...

Ferb's Line

 * "Platypus monsters are the only monsters to lay eggs."

Whatcha Doin'?

 * By an Isabella lookalike in the flashback to the Platypus Monster.

Perry's Entrance to Lair
(Perry was shown in his lair without entering it.)

Continuity

 * This episode appears to take place immediately after or the day after the events of The Flying Fishmonger.
 * 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.

Background Information

 * The 19th episode produced, 40th aired.
 * Marks the 3rd appearance of Grandpa and Grandma Fletcher.
 * This is the second Halloween episode, after One Good Scare Ought to Do It!.
 * Perry doesn't speak in this episode.
 * Jekyll's butler, Jameson, bares more than a striking resemblance to Doofenshmirtz's brother, 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.

Allusions

 * Frankenstein: The entire story of Phineastein and Ferbgor is a parody of Frankenstein, including the title.
 * 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.
 * Treehouse of Horror I and II: At the start of the episode Phineas says that it is a scary episode, introducing this episode in the style of Marge in The Simpsons "Treehouse of Horror" I and II.
 * Tim Burton's "The Nightmare Before Christmas": One of the monsters bears a striking resemblance to the scarecrow from the opening of the movie.

Cast
Vincent Martella as Phineas Flynn, Dr. Phineastein Thomas Sangster as Ferb Fletcher Ashley Tisdale as Candace Flynn, Constance Dan Povenmire as Heinz Doofenshmirtz, Jekyll Doofenshmirtz Jeff "Swampy" Marsh as Major Monogram Alyson Stoner as Unnamed Isabella Lookalike Malcolm McDowell as Reginald Fletcher Greg Ellis as Jameson