The episode begins with Margaret Robinson in the park feeding coffee and prune juice nuts to squirrels. Gumball and Darwin appear and asked to help Margaret, she shakes her head yes. While they fed the squirrels, they suddenly turn savage and attacked Gumball and Darwin and several citizens of Elmore. The Doughnut Sheriff appears and demands who was responsible for this fiasco. Margaret hid behind a tree and blames the boys for this.
As punishment, Gumball and Darwin were made to clean up the trash in the neighborhood as community service. Gumball explains to Darwin that he claims Margaret is evil. Darwin states that no one is evil, but Gumball is not sure.
The next day, Margaret starts to cause mischief again and making people's lives a misery, making Gumball and Darwin suspicious.
The next scene shows the hospital with Margaret and the boys in the baby nursery room. As Darwin explains to Margaret that she should have a good side, she swapped the baby name tags, making their parents fight.
Gumball and Darwin decided to ask Mr. Robinson about why his wife is evil. The boys then found Margaret's photo album, showing her wickedness side in every photo. Margaret gives Darwin a chocolate bar and eats it, but starts choking on it, revealing a toy truck. Darwin asks her to help, but Margaret just smiles evilly at him as she closes her door. Darwin now sees that Margaret is really evil, and he and Gumball decide to stop her.
At the Elmore mall, Margaret puts on a bandana and hijacks a car. She then rampages inside the mall in an attempt to run people over. Gumball and Darwin catch up to her, and pulled the car trigger in reverse, making it drive backwards and crashing into a lamppost. The boys explain to Margaret that there are consequences for her actions.
The Doughnut Sheriff arrives to arrest Gumball and Darwin as Margaret drives away evilly, Darwin yells about justice, and Margaret hits another lamppost, crashes into two gas trucks, which suddenly explode, sending her flying in the air, got hit by a passing airplane, then finally gets run over by an ambulance, ending the episode.
This is the third time that a character (Margaret) was accidentally run over by an ambulance, the first two times occurring in "The Mystery."
A baby version of The Butterfly from the episode of the same name can be seen in the nursery room.
The televisions in the sports section of the mall show clips of Ocho from "The Tape."
The scene where a squirrel bursts out of Hank's shirt is a reference to the infamous chestburster scene from Alien.
"The Wicked Song" is a parody of the song "My Favorite Things" from the musical The Sound of Music.
Mr. Robinson's explanation for why his wife is evil is a reference to a similar quote uttered by Batman's butler in The Dark Knight, to explain the actions of the Joker and other criminals.
The "chocolate egg with a potential choking hazard inside" that Darwin eats is a reference to "Kinder Surprise Eggs," popular chocolate egg candies from Germany with various little toys inside. The "potential choking hazard" part is a reference to how the chocolate eggs were banned from sale in the USA due to the toys inside posing a choking hazard to children under 3 years of age.
The composition that plays during Mrs. Robinson's rampage through the mall is the Tritsch-Tratsch-Polka, which was composed by Johann Strauss.
When Darwin says "She needs to pay" the second time, his eyes turn back to white.
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(The episode starts with Mrs.Robinson kneeling on the grass in the park, calling the park wildlife to give them what appear to be "peanuts". She throws one to be picked up, but instead attracts the attention of Gumball and Darwin, who behave like squirrels, approaching closer to her hand, before she withdraws her hand, irritated, with the boys returning to normal behavior.)
Gumball: N-Not for us?
(Mrs. Robinson answers by shaking her head, and points behind the boys, turning to look back. They then see a tree surrounded by 3 squirrels, who look serene and innocent.)
Darwin: I didn't know you liked squirrels, Mrs. Robinson. Or the outdoors. Or Daylight...
Gumball: Or anything that doesn't involve other people suffering(!)
(Mrs. Robinson then happily hands the boys both a paper bag of "peanuts" each.)
Gumball: Thank you!
Darwin: Thank you!
(They all begin to throw the "peanuts" towards the direction of the squirrels, as they then run towards the three, feasting on the peanuts scattered in the grass, with the boys chuckling, acting affectionately towards the squirrels, until they start to become more aggresive, with Gumball soon being bitten on the hand by one such squirrel, before they start acting increasingly hostile. They soon corner the boys near the edge of a tree.)
(Darwin sniffs the "peanut")
Darwin: Dude! Those nuts are coated in coffee!
(Cut to close up of highly caffeinated squirrel)
(Gumball and Darwin hastily throw the coffee nuts away, and the squirrels go immediately after them and begin to attack other people)
(Marvin and Gary are seen covered in squirrels, panicking, Gumball and Darwin watch in horror while Mrs. Robinson relishes in the chaos)
(Cut to one of the Construction Workers getting attacked while a girl tries to get a way from the squirrels on her tricycle. Followed by the Melted Cheese Guy eating a sandwich only to have a squirrel jump out and pull his lip, Gary all the while is getting dragged into a tree hole.)
Gary: It's storing me for winter!
(Jeff, however, gets swarmed by squirrels and is eventually eaten alive)
'Jeff': My Face!
(All that's left is a mostly eaten, live action, corn cob)
(Meanwhile, the Construction Man is still getting attacked and has a squirrel burst out of his shirt á la Xenomorph)
Construction Man: AHHHHHH!!! I mean it only came through my shirt, but still, AAHHHHHHH!!!
(The boys continue to watch the ensuing chaos in despair, unaware of Mrs. Robinson's concealed presence. During this chaos, the Donut Officer cuts in, after successfully breaking free from the squirrels.)
Doughnut Sherriff: WHO IS RESPONSIBLE FOR THIS!?
(Mrs. Robinson reveals herself, framing the boys for the entire fiasco. The boys look behind themselves in surprise, The Officer about to become more furious.)
(The scene cuts to the boys, made to pick up the neighborhood trash, after the allegation.)
Gumball: (annoyed) I can't believe it(!)
Darwin: Yeah, I know. Soaking those nuts in prune juice was overkill.
Gumball: No, I mean I can't believe how Mrs. Robinson could be that evil.
Darwin: Dude, no-one is truly evil.
(Margaret continues to make people's lives a misery. Mr. Small is planting his flowers and she cuts them. Margaret then opens a garbage can releasing flies, opens a mailbox and throws the mail all around, she throws liquid on Principal Brown's car, pickpockets a goblin's wallet, spray paints a speed limit sign to 800 mph and slaps Billy's ice cream off his hand causing him to cry and grow a large tear. She takes a glass and drinks Billy's tear, finally she throws Marvin's keys in his car.)