Milo Murphy's Law Wiki

Plants forever!

— Derek, "The Phineas and Ferb Effect"

Derek, also known as Evil Orton, is the only remaining Pistachion from the original group of King Pistachion's kin. He built and lead his own Pistachion army in an attempt to overthrow the humans and take over the world. He appeared as the secondary antagonist of the Pistachions Arc, serving as a minor antagonist in "Missing Milo" and as the main antagonist of both "Fungus Among Us" and "The Phineas and Ferb Effect".

He is voiced by Jeff Bennett.


Like King Pistachion and the other Pistachions, Derek is bent on world domination. He spent seven years alone brainstorming his overthrow of the humans before carrying out a plan that would take fifty years to complete. He appears to be a strong leader and is generally well respected by his kin. The plan he designed relied heavily on patience and stealth, and up until the end had been executed flawlessly.

In spite of his dedication to carrying out his father's plans, Derek took a summer off to do some modeling. He calls himself young and foolish for doing so but claims he has no regrets.

He has a habit of focusing on his own monologues to the point he becomes oblivious to the actions of his prisoners, who've escaped a number of times because of it. This is a trait that stays with him throughout all fifty years of his plan, from his first confrontation with Milo in the studio to his final attempts at converting the last of the humans.

Physical Appearance[]

HIding as an Intern

Derek, disguising himself as an intern.

Like the other Pistachions, Derek is a large humanoid pistachio plant.

Disguised as an intern, he looked like a light skinned human with short brown hair and black, thick-framed glasses. He wore a white collared short-sleeved shirt with a blue-grey tie and a pair of pants with visible seams and a black belt. His shoes were brown loafers with darker laces and white socks.

Afterward, he donned a disguise to look identical to Orton Mahlson wearing his Doctor Zone outfit but soon removed the mask, keeping the costume. After removing the gift box, his right hand was exposed as plantlike, while his left hand remained human-like.

Present day[]

Taken It Off While

Derek, seeing how his face has changed in fifty years.

Derek removes his mask for the first time in fifty years, having been disguised as Orton Mahlson throughout that time. Because of this, his head ended up shaped exactly the same as Orton's, with a prominent chin and a hat-like clump of brown foliage growing off of the top of his head.

Derek now towers above the rest of the Pistachions, with a body that resembles King Pistachion's in size and shape. He wears an outfit identical to that of Doctor Zone's, save for being shredded at the legs due to his size.


PnFE 07

King Pistachion had taught a young Derek and his siblings that, should they ever get separated, they should 'find an adult, impersonate them, and take over the world'; advice Derek took to heart. He was part of the initial Pistachion takeover, where he helped his father in his attempt to overthrow the humans.

Recent Events[]

In "Missing Milo", Derek stowed away on the time limo as it re-entered the time stream, he grabbed Milo's sleeve as Milo was checking the limo's antenna. Dakota hit Derek with a bag of clocks he found at the futuristic library. He eventually fell out of the time stream into 1955.

In "Fungus Among Us", Cavendish, Dakota, and Milo met Derek in 1965 after Milo got a call from Dakota (in the present). They wondered how he remained after Diogee peed on his father's seedling. So Derek explained his backstory and his own plan for overthrowing the human race. Back in the present, his plan seems to be working.

In "The Phineas and Ferb Effect", Derek first appears disguised as Orton as he confronts Melissa, Zack, Buford, and Baljeet, but they escape while he's busy explaining his plan. Derek later appears again at the unveiling of the M.U.L.C.H. machine, where he goes on air to announce his plans for world domination. After unsuccessfully trying to destroy the remaining humans, he sends their recently converted friends and families after them as Pistachions. He finally makes one desperate attempt to stop them himself when he sees Professor Time's time machine, but ultimately fails, and is erased from the timeline when his past self is destroyed.


King Pistachion[]

King Pistachion is Derek's father. In his own words, Derek wanted nothing more than to impress him, and carefully followed the world-domination advice his father had given when he was young. Like the other Pistachions, he strived to follow his father's orders while under his rule and continued to try to overthrow the humans even after the rest of the original Pistachions, his father included, had been erased from existence.

Orton Mahlson[]

As the star and creator of the Doctor Zone franchise, Orton Mahlson was the central focus of Derek's scheme to take over the world using the show's profits. He was easily able to trick Orton and steal his identity and went on to pretend to be him for the next fifty years after the real Orton managed to escape. Orton, alongside Professor Time, was responsible for going back in time and destroying Derek before he could begin the invasion.

Milo Murphy[]

PnFE 06

Derek had initially confronted Milo in the timestream, having grabbed him by the sleeve, only to get knocked off the time limo by Vinnie Dakota. This caused him to land in the past in the first place. He had another run-in with Milo while in disguise at the start of his plan, where he exposed himself as a Pistachion but failed to capture him before he could escape.

Much like his father, Derek's thinks him as his Arch Enemy and his final conversation before fading from existence happened with Milo, who'd played a major role in his defeat.


Click here to view more images from Derek.
The image gallery for Derek may be viewed here.


Season 1[]

“Wait! Are you King Pistachion?”
“No. I'm Derek, the king's son. Don't you remember? This guy knocked me off the time limo with a bag of clocks.”
Milo Murphy and Derek[src]
“Anyway, I fell out of the time stream and landed in 1955. I spent the next ten years planning my own overthrow of the humans.”
“Ten years?”
“Well, the first seven years were brainstorming, and you know, I had to find an apartment, and I did take one summer off to do some modeling. Yes, I was young and foolish, but I regret nothing!”
Derek and Balthazar Cavendish[src]
“Then over the last six months, I have really buckled down, and now I have a foolproof plan! Using the profits from this Doctor Zone show, I will systematically replace human beings with Pistachions wearing rubber masks, until we outnumber everyone and overthrow the human race! HAHAHAHA HA HA HAHA... ha ha... Oh, fertilize me!”
—Derek, monologuing his evil plan, then noticing that his victims are already gone[src]
“Seriously, did you just let them leave?”
“Well, we didn't want to interrupt you.”
Derek and Another Pistachion[src]

Season 2[]

“Let me set the stage for you kids. Imagine a young plant who wanted nothing more than to impress his father...”
“Apparently I was better at stealing identities than running a TV show.”
“Hello, humankind. It's time! Time for a change. No longer will we be wearing silly rubber masks. Prepare to fall before my M.U.L.C.H. machine! Which stands for Machine Used for Literally Converting Humans... To Plants.”
“What about those last two letters?”
“Yeah. Shouldn't it be M.U.L.C.H.T.P.?”
“The T.P. is silent!”
Derek, Baljeet, and Buford[src]
“You think you've beaten me? Your family and friends are now mine! Plants forever!”
“No! It can't be! It was working! We had won! How could it all go so wrong?!”
“Well, that's Murphy's Law for you!”
Derek and Milo Murphy[src]


Season One[]

Season Two[]


  • He owns an apartment.
v - e - d Characters
Main Characters Milo MurphyMelissa ChaseZack Underwood
Supporting Characters Balthazar CavendishVinnie DakotaDiogeeMartin MurphyBrigette MurphySara MurphyAmanda LopezMort SchaefferBradley NicholsonElliot DeckerHeinz DoofenshmirtzPerry the Platypus
Recurring Characters Richard ChaseEileen UnderwoodMarcus UnderwoodChad Van CoffElizabeth MilderKyle DrakoMs. MurawskiNolan MitchellScottBrickSavannahMr. BlockOrton MahlsonLydiaJoniNealBob BlockFrancis Monogram
Story Arc Characters Orton MahlsonPistachionsSentient BlobKing PistachionDerekGiant PistachionLost DakotasPhineas FlynnFerb FletcherCandace FlynnBuford Van StommBaljeet TjinderIsabella Garcia-ShapiroOctaliansAlien CommanderAlien PilotLoabKhoneOrgaluthCavenpuss
Families Murphy: Martin MurphyBrigette MurphySara MurphyMilo MurphyDiogeeJoey MurphyLaura MurphyNate MurphyGrandpa MurphyGrandma MurphySheriff MurphyMurphy Family
Underwood: Marcus UnderwoodEileen UnderwoodZack UnderwoodZeldaCornelius Underwood
Chase: Richard ChaseMelissa ChaseAbigail Chase
Jefferson County Middle School Students: Milo MurphyMelissa ChaseZack UnderwoodAmanda LopezMort SchaefferBradley NicholsonChad Van CoffLydiaJoni
Staff: Elizabeth MilderKyle DrakoMs. MurawskiNolan MitchellMs. WhiteFredMr. HartoonianMs. Whipley
Related: Elliot DeckerMs. DeckerMs. BaxterMr. Blunt
Cavendish and Dakota's Jobs Bureau of Time Travel: Mr. BlockGretchenBrickSavannah
Paranormal Investigation Group: Bob BlockArmory Security GuardBalthazar CavendishVinnie Dakota
Related: Lost Dakotas
The Doctor Zone Files Show and Cast: Orton MahlsonDoctor ZoneTime Ape
Fans: Sara MurphyKrisWallyJosh
Non-Human Characters Pistachions: King PistachionDerekGiant PistachionDennisJerry
Octalians: Alien CommanderAlien PilotLoabKhoneOrgaluthBeekMantelDorsalZorb Zerbavoir
Phineas and Ferb Characters Heinz DoofenshmirtzPerry the PlatypusFrancis MonogramCarl KarlPhineas FlynnFerb FletcherCandace FlynnJeremy JohnsonBuford Van StommBaljeet TjinderIsabella Garcia-ShapiroVanessa Doofenshmirtz
Other Characters Kids and Teens: NealThe LumbermaxesMaxJackieCharlene and Sharon BruleeHenryWendyLizzyLola SunderguardJohn and Jake JacksonRain and StormAnthony and AshleyBilly BisonToby
Adults: ScottVeronicaTobias TrollhammerVictor VerliezerClyde RickenbackerMr. BruleeMrs. BruleeShelleyTrucker TedForemanDaveEuniceJavierJimSlashGretchen FlammkuchenPhillipColonel NibletLieutenant TennantJefferson G. CountyEuniceMayorCaptainSergio McGuinnessWilsonDr. Not SorryRusty WallaceNASCAR RacersMike JoyBasil BravoJoseDirectorMuseum Tour GuideSallyPower Plant EmployeePete and TinaCorn Field FarmerEvan ChaffeToby's GrandfatherVlad and IgorFuller and HastingsNature Surveyor
Animals: LlamasRecurring RaccoonZippyAgent GPioBeauregardCyborg BearRex
Misc: Lardee BoyC.I.D.D.AliensSentient BlobCavenpussMinor Characters