Gumball refuses to accept he is the only kid at school that doesn't have special powers. He convinces Mrs. Jötunheim, Hector's mom, to take him on as her apprentice but she soon learns leaving Gumball unsupervised around magic is a big mistake.
The episode starts with Gumball in the cafeteria trying to demonstrate some special power to Darwin, though he fails to display any legitimate talents. Darwin suggests that Gumball actually learns a talent, though if the past serves to remind them, it would not pan out particularly well. Gumball then spies Mrs. Jötunheim picking up Hector from school, and awestruck by her magical prowess, decides to learn magic.
The pair set out to the Jötunheim residence to confront Mrs. Jötunheim about Gumball's aspirations, who reluctantly complies. However, she does not actually teach them about magic at all, instead manipulating Gumball's desperation to clean up her cave. None the wiser, Gumball and Darwin jam out to a song and begin to feel their magical powers emerge, though it turns out to be nothing more than hallucinations from cleaning supply fumes. Mrs. Jötunheim then instructs the two to clean her basement so long as they do not open the Door of Forbidden Secrets.
Gumball being Gumball, though, he does it anyway, and Darwin gets dragged in by a troll. He confronts Mrs. Jötunheim who, fearing the turmoil of a lawsuit, decides to help him out. To compensate for his not actually learning any magic, she gives him a wizard's hat with the demo versions of her powers.
Meanwhile, the escaped troll insults Mr. Small into submission before grabbing ahold of him. Mrs. Jötunheim quickly arrives at the scene with Gumball, instructing him to deal with the troll while she wipes Mr. Small's memory. However, Gumball proves fairly inept with his powers, resulting in Mrs. Jötunheim getting eaten and the hat being destroyed. All hope seems lost, but as he starts to correct the troll's grammar and struggles to figure out what exactly a troll is, Mrs. Jötunheim is released. Thus, by continuing to inadvertently "troll" the troll, Gumball saves the day, with each remark causing it to shrink until it disappears. The episode ends with Gumball's realization that he does indeed have a special power: his supernatural annoyance.
This episode is reminiscent of The Sorcerer's Apprentice act from Disney's Fantasia, where Mickey Mouse studies under a powerful sorcerer while doing chores for him.
The hat that grants Gumball magical abilities is a reference to the act in Fantasia where Mickey steals his master's hat and acquires magic powers after putting it on, and loses them once he takes it off.
The living carpet and genie in the lamp are references to characters from the film Aladdin.
Mrs. Jötunheim: [Exits the cave] All right, okay, fine. You can come in. Just stop screaming that on my doorstep.
[Inside, the brothers are hand-washing an assortment of dishes]
Darwin: I really don't see how this will teach you magic.
Gumball: Uh, duh! It's teaching our hands to make perfect circular motions for spells. Right Mrs. Jötunheim?
Mrs. Jötunheim: [Off in the distance] Ehh.
[The two are now in a corridor, sweeping away some dust]
Darwin: I think she's just using us to get her chores done.
Gumball: Why would she make us sweep the floor, if not to teach us how to fly on a broomstick?
[In the washroom, Gumball and Darwin are fighting to clean a living, monstrous latrine, with toilet brushes]
Darwin: Yeah, I know what you're gonna say. This is teaching us how to wave a wand or something.
Gumball: [Interrupts] Bup-up-up! Sounds like someone needs a little motivational song.
[He uses his brush as an imitation guitar, and rock music plays in the background. During the song, they continue to work through the supernatural variations of otherwise menial tasks]
So you've got a new ambition to become a great magician
But first you must do time for Mrs. Jötunheim
You need to beat away the dust if you want to earn the trust
Of the wizard and the druid, so get out your cleaning fluids
If you wanna a crystal ball, be sure to clean it all
Do your chosen focus to learn the hocus-pocus
Yeah, yeah, yeah. Whoo
Get down and do the graft to be a master of the craft
You gotta clean the decks if you want to learn the hex
Perfect your washing motion to get good at making potion
Clean the fridge and then the oven to join the witches' coven
You don't wanna be a doctor, a lawyer, or a dentist
You wanna study magic, be a sorcerer's apprentice
If you wanna be a witch, well, here's the sitch
Look at me, I was born magical powers
[Exhausted, Gumball and Darwin decide to rest for a moment. All of a sudden, a strange energy envelopes them both]
Gumball: Wait... I think I can feel something!
Darwin: You're right! I can feel my magic powers growing!
Gumball: The power, it's happening!
[Their muscles bulging, the two develop at an accelerated rate, turning into bearded giants. Laughing all the while, they begin to cast powerful spells with reckless abandon. Meanwhile, back in reality, Mrs. Jötunheim walks in on the brothers spacing out amid the fumes of several spilled cleaning products]
Mrs. Jötunheim: What the?! What are you doing?! [Magically cleans up the mess] You don't have enough brain cells to afford to fry them like that!
Gumball: Wait, what? We haven't learned any magic?
Mrs. Jötunheim: No.
Darwin: What?! Why?!
Mrs. Jötunheim: Because you, uh... haven't finished cleaning the basement.
Gumball & Darwin: Ohh.
[They run off]
Mrs. Jötunheim: [Calling after them] Just don't open the door of forbidden secrets!
Gumball: Hmm. [Glares at her suspiciously; Sneezes] Sorry. There's been a lot of dust today. Okay, we won't touch that door.
[Gumball and Darwin leave again, and head down the basement stairs carrying a mop and bucket. After passing by a large, ominous looking door, they stop, and so does the ambient background music. Both of them walk backwards, and the music reverses as well. After some more back-and-forth, the two approach the door]
Gumball: That boring door looks like the most amazing thing I've ever seen. [Reaches for the skull-shaped ring pull]
Darwin: [Angry] What are you doing?! She clearly doesn't want us to go in!
Gumball: [Picks up a cloth] I'm just... polishing the handle. [Opens the door a crack; Sarcastic] Oh, no! It opened by mistake.
[A dark shadow appears on the other side, accompanied by a loud roar. In an instant, Darwin is pulled through the gap, and the door slams shut. Gumball goes upstairs to Mrs. Jötunheim]
Gumball: [Nervous] Soo... I've got a question. Do trolls like, uh, normally eat people?
Mrs. Jötunheim: Normally, trolls bait people to make them angry. They feed on people's anger.
[Gumball sighs in relief]
Mrs. Jötunheim: And then they eat them. [Concerned] Wait, please tell me you didn't feed the troll.
Gumball: I... didn't feed the troll?
[The aforementioned creature crashes through the room and makes for the exit]
Gumball: It fed itself... on Darwin.
Mrs. Jötunheim: [Frantic] This is terrible! A troll on the loose, and a missing child! This could lead to... [Hushed] a witch trial!
Gumball: [Scared] You mean with pitchforks and flaming torches?
Mrs. Jötunheim: No, way worse! With lawyers and court fees! And it's my money that's gonna burn.
Gumball: It's okay, I'll help you using the magic you taught me.
Mrs. Jötunheim: Oh yeah, about that... I wasn't training you, I just tricked you into doing my chores.
Gumball: [Gasps] But how?! [Slyly] Was it some kind of magic mind trick?
Mrs. Jötunheim: Nah, just a regular mind trick.
Gumball: [Disappointed] Oh.
Mrs. Jötunheim: Ah, come on. [Hands him a wizard hat] Put this on, it'll give you magic powers.
[Elsewhere, in Elmore, Mr. Small is casually crossing a bridge over the flood control channel. A deep voice addresses him from somewhere down below]
Troll: Global warming isn't real!
Mister Small: [Leans over the railing; Vehement] I'm sorry, but there are scientific proofs that--
Troll: I think you mean, "There is scientific proof." Don't they teach grammar at yoga academy?
Mister Small: For your information, yoga is a very physical and noble activity!
Troll: No need to get so excited, hon.
Mister Small: I am a man!
Troll: Hard to tell with that voice and that ponytail. You don't have to get all defensive.
Mister Small: I'M NOT BEING DEFENS--
[Mr. Small screams when the troll's hand reaches up to grab him. He is immediately freed by a well-aimed magic missile, which leaves an unusual cloud of smoke upon impact. Mrs. Jötunheim and Gumball ride by on brooms]
Mrs. Jötunheim: You only have the demo versions of my powers. Every spell you cast has a watermark. Now, you take care of the troll while I erase Mr. Small's memory.
[Mrs. Jötunheim lands on the bridge, using her wand to blow a puff of sparkling green mist at Mr. Small. His eyes turn pink as he coughs, laughs, then falls unconscious. She gives a thumbs-up to Gumball, who is running to the opposite railing. The troll crawls out from under the bridge and stands, towering over him]
Gumball: [Casting a spell] Unexpecto amphibiosis!
[It misses, striking an airplane high in the sky and turning it into a frog]
Mrs. Jötunheim: Aah! What are you doing?!
[She reverses the transformation moments before it hits the ground, and the plane resumes its flightpath directly overhead. The troll narrowly avoids the aircraft, then prepares to strike]
[The troll vanishes from sight]
Gumball: Ha! Gotcha!
[A growl shakes the area]
Mrs. Jötunheim: Agh! You didn't make him disappear!
[An unseen attack knocks Mrs. Jötunheim and Gumball off of the bridge and into the channel]
Mrs. Jötunheim: You made him invisible!
[Up ahead, the after-effects of the creature's heavy footsteps draw closer]
Gumball: I think I know where he is. Take this! Electriosis!
[He zaps the troll with lightning, dispelling the invisibility, but fails to take into account the shallow stream of water connecting them. The current travels toward Gumball, and Mrs. Jötunheim shoves him aside]
Mrs. Jötunheim: Watch out!
[She gets electrocuted in his place, and falls forward. The troll tries to crush her with its fist]
Gumball: Uh, T-T-Teleportarion!
[His spell sends Mrs. Jötunheim directly above the troll. Thinking that she had escaped, it tilts back its head and roars, accidentally swallowing her whole]
Gumball: [Gasps] Pacificosus absolutus!
[Now under the effect of a love spell, the troll chases Gumball as he runs away screaming. After apprehending him, it begins to kiss him affectionately]
Gumball: Oh man!
[Gumball summons a block of ice, which shatters against the trolls face and loosens its grip. They both drop to the ground, opposite each other]
Gumball: Ha! Petrificus! [Notices his magic is gone] Oh, oh no! My hat!
Troll: [Collects the hat] Too late, little man! You got beat. [Rips it in half]
Gumball: [Softly] I think you mean "beaten."
Troll: Ha! You think you can troll a troll? You got a lot to learn.
Gumball: I know. I always thought trolls were like those little porcelain guys on the lawn.
Troll: That's gnomes. You know that's gnomes.
Gumball: Oh, right. You guys are the ones with the lucky charms.