The episode begins with Margaret Robinson in the park feeding coffee and prune juice nuts to squirrels. Gumball and Darwin appear and ask if they can help Margaret feed the squirrels, and she shakes her head yes. Upon doing so, however, they suddenly turn savage and attack Gumball and Darwin as well as several citizens of Elmore. The Doughnut Sheriff appears and demands who was responsible for this fiasco. Margaret blames the kids, causing the two to get reprimanded.
As punishment, Gumball and Darwin are forced to clean up the trash in the neighborhood as community service. Gumball explains to Darwin that he thinks Margaret is evil, but Darwin denies, believing that there is no such thing as a truly evil person so much as people who do bad things because they are unhappy. Just as he says it, thought, Margaret proceeds to almost run the two over while laughing maniacally.
The next day, Margaret runs around town causing havoc to its residents while Gumball and Darwin watch in horror. Afterwards, Darwin still denies that she is truly malevolent and sets out to prove to Gumball that there is still some good left in her.
Darwin, accompanied by Gumball, then tricks Margaret into meeting them at the hospital nursery, trying to get her to return to her time of innocence. However, she instead walks into the nursery and switches the names of two of the babies, making their parents get into a fight. Darwin attempts talking sense into Margaret, but it gets lost in translation.
Later, Gumball and Darwin decide to ask Mr. Robinson if they can clean his house in hopes of finding something out about her past by searching his attic. The boys look through Margaret's photo album only to find that she was always evil, something that Mr. Robinson then proceeds to clarify.
Outside of the house, right as Margaret arives, Darwin pretends to choke on a chocolate egg in an attempt to urge her to help him. Instead, she runs to the chocolate egg on the ground and eats it, spitting out a toy car hidden inside. Disinterested, she throws it over her shoulder where it lands in Darwin's mouth, causing him to choke for real. Regardless, she refuses to help, instead smiling maliciously as she watches him suffocate. Seeing this, Darwin becomes immediately disheartened and attempts to find a means to exact revenge.
Gumball and Darwin then decide to go to the Elmore Mall to frame Margaret for a crime: they leave their keys in the family car, hoping to get a photo of her carjacking it. The plan proves to be perhaps a bit too successful as Margaret drives wrecklessly through the mall in it, covered by a bandana to protect her identity. The kids have no choice but to run after her.
Eventually, the pair catches up to her, with Gumball jumping into the car and forcing it into reverse, causing the car to back up and rear-end a streetlight. Darwin explains that Margaret needs to learn that her actions have consequences, causing her to feign apology and shake their hands, giving them her bandana and thus framing them for the crime. Just as they are arrested by the Doughnut Sheriff, Darwin loudly asks if there is any justice in the universe.
Almost immediately after, a chain reaction occurs: the streetlight falls on Margaret's car as she drives off, causing her to swerve into a sign. She then becomes disoriented and is blasted by a busted fire hydrant into the highway where her car is crushed by two trucks. She falls into a puddle of oil pouring from the trucks which is then ignited by a broken cable, causing an explosion that rockets her into the sky, where she gets hit an airplane. She finally lands on the ground, only to get run over by an ambulance. Gumball and Darwin wince, 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.)