It is Mother's Day and all the students are making cards to express how much gratitude they feel for their respective moms. Gumball and Darwin are making a card that represents Nicole as a superhero. Darwin states that their card needs more glitter, to which Gumball responds it is already so shiny he needs sunglasses to read it. Darwin says he does not want to disappoint her like last year. They then remember past year, when they offered her a "perfume," which was in reality an air freshener. Nicole, not to disappoint her sons, who intended to impress her in Mother's Day, tried her new "perfume," which burned her eyes. Going back to the present, Darwin points out that their gift made her smell like a car for months, although Gumball responds to him that she "loved it." Tobias interjects into their conversation, replying that "Superest Mother in the World" is written on their card. He claims that his mother is better than theirs, to which Gumball answers that Tobias' mom is only better at being "average," because Nicole is awesome. Banana Joe also decides to interject into the conversation, alleging that his mother is the best in the world and indicating that it is written on his card. Gumball replies that just because he wrote something on a piece of paper, that does not mean it is true. Darwin questions Banana Joe about his card and he decides to show it, revealing it is a sad clown with "Superest Mom" written at the top, although Banana Joe is convinced that it is a banana.
Gumball explains that their mothers are only the best mothers in their neighborhood, to which Darwin replies that, sometimes, Nicole also drives down their street. Due to this, Gumball reconsiders, concluding that Darwin is right and claiming that their mothers are only the best inside their own houses.
The school bell sounds. Gumball and Darwin are about to leave the classroom when Tobias manifests, telling them to back off. Gumball also tells him to back off, starting a whole discussion of "Back offs." Darwin, sick of their discussion, asks them, rhetorically, if they are going to fight or dance. Gumball has an idea about how to determine the best mom ever but before revealing it, he is interrupted by Banana Joe, who suggests trapping their moms inside a cage, where they will fight to the death. Gumball refuses and proposes to establish a contest in which they will evaluate each mother's qualities and determine who has the best mom ever.
After school, Gumball and Darwin bring their mom, Nicole to the mall. Nicole has closed her eyes wondering about the surprise her sons have organized to her. When wondering about a new haircut, Nicole states that the last time Gumball and Darwin tried to cut her hair she had to wear a back brace and a wig for a month. Gumball suggests her to enjoy some time in the mall because they have to do something more. They meet with Tobias and Banana Joe, asking them if they have also brought their moms. Tobias and Banana Joe respond that yes, they did it. All of them, including Darwin, start commenting how shameful it will be when realizing that one of their moms is better than the others. They stop and, to be clear, Gumball assures that none of their moms knows that they have established a contest to identify the best mom ever. After making sure everything is right, he interrogates everyone, asking if there are more questions. Banana Joe asks him if the question has to be related to their plan, to which Gumball agrees. He makes another question but Gumball ignores him and decides to start officially their contest. The first round is speed.
Nicole is rising on an escalator. However, Tobias modifies its direction so it moves downwards, while increasing its speed. Nicole starts running, jumping over a bunch of people who are trying to come down. She is running so fast that, as soon as Tobias turns off the escalator and recognizes, reluctantly, that Nicole has won this round, the power of inertia makes her continue running, breaking a window and fly over the mall on a huge speed. The next round is reflex challenge. Banana Barbara is walking on the mall when, suddenly, a tin can hits her on the head and she passes out. Banana Joe hit her with the can so he could prove his mother had good corporal reflexes. Darwin suggests that Banana Joe should try to warn his mother. He throws her a can, hitting her on the head again and saying to watch out then. Darwin mentions that Banana Joe should have warned her before throwing the can. He decides to throw it one last time and warns his mother, who is too slow to understand she is about to be hit and injured a third time. Gumball decides to attribute her one point for having survived that. It is then time to test Jackie. As she walks near to the fridges zone, Tobias lets one of them fall over his mom, who catches it and raises it with her "super strength," surprising Darwin, Gumball and Banana Joe so much that they decide to go away, preparing themselves to the next challenge. However, it is revealed that both Tobias and Jackie are cheating in the contest, ashe fridge that fell over her is made of cardboard.
More challenges are made. They are always introduced by Darwin with unusual lady's legs. And in all of them, Tobias and Jackie cheat on the contest, prejudicing Nicole and Banana Barbara to win every round.
At the last challenge, which is the Hot Sauce Challenge, Jackie tastes a whole bottle of spicy pepper. Tobias praises her and winks his eye to her. However, that denounces them and Gumball understands that they replaced the hot sauce for ketchup and have been cheating all the time. Jackie denies it several times but she is forced to admit it later. After that, Banana Barbara shows up and tastes a spoonful of hot sauce, which makes her blow up.
Nicole is sitting down on a chair, tired due to the contest Gumball, Darwin, Tobias and Banana Joe organized secretly. Gumball and Darwin decide to show up and announce they she has won their contest and has proved to be the Best Mom ever. However, when she discovers she has been suffering all this time because of them, she angrily punishes her sons by sending them to the car.
Gumball and Darwin now understand that what they did to their mom was wrong and decide to make things right for Nicole, and decided to write on a sign how much regretful they are for having upset her. Nevertheless, they get suspended when their scaffold falls, facing a certain death. Gumball starts screaming. Darwin replies that his mom cannot hear him, but incredibly, Nicole (who was in a salon) heard his cries for help, understanding they are in danger and decides to rescue her sons (while wearing a cape from the hair salon and getting a curl of hair on her head from one of her hair curlers). When reaching the building where they are, a guard interrupts her, claiming that only cars can pass through the gate. She ignores him and immobilizes him, managing to reach the interior of the building. Gumball screams to her that they are at level thirty-two, which upsets her because she is already very tired. However, the commercial sign they are holding onto rips and they go down to the level sixteen. A crowd is observing this horrible scene. Gumball's pants go down and his underwear are exposed, which disgusts them.
Gumball and Darwin cannot hold on to the commercial sign for much longer and start to fall. However, Nicole grabs an extinguisher hose, attaching it to her body and jumping from the level sixteen to catch them. She is able to save her sons, and Gumball and Darwin are rescued before reaching the floor and getting injured.
The crowd praises Nicole, who informs Gumball and Darwin that what they did was very dangerous, but she realizes they did all of that to impress her and her sons really could do something special for her. Gumball tells her she is the superest mom in the world. Banana Joe shows up and tells to his mom she is the superest mom in his heart. Tobias decides to offer a card to Jackie but when she is about to receive it, her son rips it and looks at her with a disappointed glare.
Nicole mentions she needs help to go to the car because she put her back out. Gumball tells her she is invincible and can do everything, to which she responds that she is not a superhero, just a regular mom would do to her sons. She rises up and says, "Now come on. Let's go home," and the hose roller which she is attached to falls from the level sixteen, getting on a street light and hoisting her, which makes her appear to be flying like a superhero. However, the other side of the hose comes down and crashes into the ground, ending the episode.
When Banana Joe asks "Is pizza really a vegetable?" it may be a reference to a 2011 congress bill concerning nutrition in school lunches that claimed that pizza was a vegetable due to the tomato sauce on it.
When Nicole says "I think this thing is broken," her voice actress, Teresa Gallagher, starts to slip into her natural British accent by accident.
When Nicole is slipping onto the oil, her skirt is colored pink instead of gray.
After Jackie cheats at the hot sauce challenge, bottles at the hot sauce stand suddenly appear.
In the resilience challenge, the shelves disappear, even though the cans are inside the shelves.
When Gumball fights Tobias, his outline disappears.
Janice can be seen outside the parking lot when Gumball and Darwin are hanging from the banner, but it then appears inside the parking lot before Nicole saves them.
Banana Joe's leg is detached from his body when he asks Gumball questions.
Gumball: Dude, this is already so shiny, she'll need sunglasses to read it.
Darwin: I don't want her to be disappointed like last year.
Gumball: What are you talking about? She loved her Mother's Day present!
[Turns to flashback, Nicole has her eyes closed]
Gumball: You can open your eyes now.
Nicole: [Opens eyes] Oh. Wow. An air freshener.
Gumball: [scoffs] No, silly! It's perfume. Try some.
Nicole: 'Course. Uh, I'll put some on right away. [Sprays the air freshener in her face. Her eyes tear up and she starts wheezing] It's...distinctive.
Gumball: Well, it still smelled nice— kind of like a pine forest.
Darwin: She smelled like the inside of a car for months. Every time she walked by, I couldn't help but reach out for my seatbelt.
Gumball: Well, she won't be disappointed this year! We made the best card.
[Their card is shown. On it is "Happy Mother's Day" with a muscular Nicole wearing a cape]
Tobias: Guys, I'm sorry. But I think there's a mistake on your card. It says, "Superest mom," but I'm afraid mine is. So— [Blows raspberry]
Gumball: Dude, there can only be one superest. And the only thing your mom is super at is being super average. So— [Taunts Tobias with weird gestures, then a whistle]
Tobias: What was that?
Gumball: I'm not sure.
Banana Joe: Your mom's aren't the superest, mine is! It's written right here.
Gumball: Dude. Just because you wrote something, doesn't mean it's true.
Darwin: What is it anyway?
Banana Joe: What do you mean, "What is it?" It's a banana!
[He shows his card. On it is "Superest mom" with a sad clown's face. No one says anything, and he puts his arm down]
Gumball: Look. I don't wanna break anyone's heart here. But at the max, your moms could be the superest in your neighborhood.
Darwin: Well, sometimes, Mrs. Mom drives down their street.
Gumball: Oh, yeah, right. Superest mom in your house then, tops.
[The bell rings. Gumball walks to the door only to be blocked and pushed away by Tobias]
Tobias: Back off, man!
Gumball: [Spins, then pulls a fighting stance] How 'bout you back off?
Tobias: [Spins, then pulls a fighting stance] You back off!
Banana Joe: [Does some swinging punches] Ohhhhhhh! You back off!
Darwin: [Sarcastically] Are you guys gonna fight, or dance?
Gumball, Tobias and Banana Joe: Dance. Probably dance.
Darwin: Then how are we gonna settle this?
Gumball: There's only one way to settle this. [Zooms in dramatically on his face]
Banana Joe: We put our moms in a cage! Three go in! One comes out! Three go in, one comes out [Quiets down]
Gumball: There's only one morally acceptable way to settle this. [Zooms in dramatically on his face] Let's have a mom-off!
The Mom-off Begins
[Gumball, Darwin, and Nicole are walking in the mall. Nicole has her eyes covered]
Nicole: It's so nice that we're doing something together on Mother's Day. I can't wait to see what my surprise will be. Is it a back rub? A [Opens her eyes] haircut? [Gasps] I'd love to have it done by a professional this time. The last time you guys did it, I had to wear a back brace, and a wig for a month.
Gumball: Why don't you um… look around for a couple of hours? There's a little something we need to do.
Nicole: Oh, I see-a surprise! [Giggles]
[Gumball and Darwin laugh as they walk over to Tobias and Banana Joe]
Gumball: Ha ha ha ha ha-okay. Did you bring your moms?
Tobias and Banana Joe: Yeah!
Tobias: Did you bring your 'boo'? 'Cause you're gonna 'hoo'!
Gumball: Well, did you bring your 'f'? 'Cause you're gonna 'ail'!
Darwin: [Whispers] Gumball, that makes no sense.
Gumball: Well, what would you say?
Darwin: Did you bring your door? 'Cause you're gonna get slammed!
Gumball: [Sighs][Whispers] Yeah, that`s way better. Anyway! Just to be clear: none of our moms know what's going on, right?
Banana Joe: My mom never knows what's going on!
Gumball: Good… anyone got any questions?
Banana Joe: [Raises hand] Ooh!
Gumball: Yes, Joe?
Banana Joe: Does the question have to be related to the game?
Gumball: Yes. Yes it does. Any other questions?
Banana Joe: [Raises hand] Ooh! Ooh! Ooh!
Gumball: Yes, Joe?
Banana Joe: Is pizza really a vegetable-
Gumball: Okay. No other questions? Good! Then I declare this mom-off on! First round: speed.
Round 1: Speed
[Nicole takes the escalator, smiling peacefully. Then Tobias turns a knob in the escalator control panel, and the escalator reverses. Nicole notices]
Nicole: Uh, hello? I think this thing is broken.
[Tobias turns the knob further into reverse. Nicole starts walking upwards, and falls down. She gets up, and runs]
Nicole: Hey! Stop! Help!
[She hops over other people taking the escalator, and continues running upwards]
Nicole: Somebody, DO SOMETHING! [Crashes into Pantsbully and is knocked offscreen]
[Despite this, she is able to keep up with the escalator. At the top, Gumball and the rest are watching her]
Tobias: Okay. You win this one.
[He returns the dial to its previous position. Nicole's speed combined with that of the escalator causes her to move so fast she flies off the end of it, and through the roof]
Tobias: Next up: Joe's mom in the reflex challenge.
Round 2: Reflexes
[Joe's mom, Banana Barbara, walks around in the supermarket. She stares at everything happily until she gets knocked down by a soda can]
Banana Barbara: Ugh!
[Banana Joe and the rest are hiding behind a stack of boxes, with him holding another can]
Darwin: I think you should give her a warning. This seems kind of unfair.
[Once again, Joe's mom, now bruised, walks around and stares at everything. She gets hit again]
Banana Barbara: Uh!
Banana Joe: Heads up!
Darwin: Okay. What you'd probably want to try is shouting before you throw the can.
Banana Joe: Good idea! Heads up!
[Once more, his mom is knocked down. They all walk up to her]
Darwin: Dude! You should've called from where the can is coming.
Gumball: Let's just give her a point for surviving this. Next up: Tobias' mom. Strength!
Round 3: Strength
[Tobias' mom, Jackie Wilson, is walking in the appliances section. Tobias dumps a refrigerator on her, and she catches it but struggles to lift it up. Gumball, Darwin and Banana Joe gasp. She eventually lifts it up high, making all spectators bulge out their eyes]
Tobias: [Laughs] That's one to me! Well, Where'd you think I got my muscles from? Go on, kiss it.
[He shows off his small muscles. Gumball sighs, and everyone leaves Tobias]
Tobias: Okay, I'll kiss you. [Kisses] Alright, mom, they've gone now. You can put it down.
[His mom throws the refrigerator, and spins it around. It is revealed that the refrigerator is actually just a cardboard cutout. Tobias and his mom laugh maliciously]
Tobias: Ahh. Cheating.
The Challenge Goes On!
[A montage of the mom-off begins. Darwin carries cards with the numbers of the rounds on them, and announces]
Darwin: Round four: agility!
[Gumball knocks over a bottle of oil. Nicole walks over the oil, and manages to surpass the puddle of oil, albeit with struggle. Gumball winks at Tobias. Tobias' mom skates across the oil with a basket. He winks at her. Banana Joe's mom slips and shatters into pieces. Despite this, Banana Joe shows his pride for her]
Darwin: Round thirty-two: tolerance.
[Nicole waits in line. Then Gumball sneaks behind her, and puts a baby (who resembles an orange Billy) near her. The baby starts poking her]
Darwin: Round ninety-four: honesty!
[Tobias sneaks an unpaid shirt into Banana Barbara's basket. She then leaves the store, setting off the alarm]
Jackie: [Points to Banana Barbara] Security!
Banana Barbara: [Gets tackled by security guards]
Darwin: Round one-hundred and forty-three: intelligence!
[Banana Barbara tries to get through a revolving door. Frustrated at being unable to, she walks through it while it is rapidly spinning and gets mashed]
Darwin: [Does leg strut] Round one-hundred-
Gumball: Dude! What's up with the leg strutting?
Darwin: I'm just putting the "show" in the showdown. Am I wrong?
Gumball: Yeah! This is how you leg strut. [Does a leg strut of his own]
Darwin: [Imitating Gumball's leg strut] Round one-hundred and ninety-nine: resilience!
[Nicole grabs a can which turns out to be tied to a string. Pulling it, she causes both sides of the aisle to fall on her. However, her hand sticks out with the can she had taken]
Darwin: [Walks with "230" on card] Coordination!
[Jackie shops while dodging multiple objects]
Jackie: [Quietly while closing eyes] Duck. Right. Duck. Step. Relax.
Darwin: [Dances with "248" on card] Compassion!
[Banana Barbara lets Betty into an elevator first, but just as she gets in, the elevator doors slice her into two and ascend]
Darwin: [Dances with "274" on card] Toughness!
[Gumball and Darwin add items to Nicole's bag as she struggles to carry it]
Darwin: [Dances with "286" on card] Endurance!
[Jackie is sprayed by many perfumes. She reveals that she is wearing mask with a mouth drawn on it]
Darwin: [Leg struts with "302" on card] Sensitivity!
[Banana Barbara plays the piano. On the first notes, the piano breaks and spontaneously catches fire]
[Nicole picks up a shirt, and is tackled by other women]
Darwin: Reading skills!
Banana Barbara: [Gets run over by grocery cart]
[Nicole withdraws money from an ATM, but is denied. She roars in fury as the background catches fire]
Darwin: Bravery! [Continues announcing]
The Hot Sauce Challenge
[Gumball gives a point to his mom on a scoreboard]
Gumball Okay. This is the decider.
Darwin: The hot sauce challenge! Mrs. Wilson's up first. Can she stomach a spoonful?
[Mrs. Wilson walks up to Karen at a hot sauce stand, and refuses a spoon of hot sauce]
Darwin: Oh, and it's a refusal.
[Then she takes the whole bottle]
Darwin: What the-?
Jackie: [Downs the entire hot sauce bottle]
Tobias: And Mrs. Wilson wins! [Winks at her]
Jackie: [Winks back]
[Everyone notices this]
Gumball: Wait a minute. Did you just wink at your mom, Tobias?
Gumball: Wha-? Did you just cheat, and swap the hot sauce with ketchup?
Gumball: Have you guys seriously been cheating all this time?!
Gumball: [Faces Mrs. Wilson] Do you still think it's necessary to deny it?
[They all walk away. Banana Barbara comes to the hot sauce stand]
Banana Barbara: Oh! Hot sauce? [Tastes] Mm. [Walks off; her back explodes]
[Nicole is exhausted, and panting heavily from the competition. Gumball and Darwin come to her]
Gumball and Darwin: Mom! You won!
Nicole: What? What do you mean?
Gumball: We had a competition to decide who was the Superest Mom in the world, and you won! [Shows mother's day card]
Nicole: Guys, I'm no superhero.
Gumball: But you are! You've endured all the trials we've put you through and succeeded! The escalator, the oil, the shelves-everything!
Nicole: [Chuckling] Oh, I see. Come closer. Would a superhero do this? [Angrily yells] GET IN THE CAR! YOU'RE GROUNDED!
Making Things Right
[Gumball and Darwin walk to the car]
Gumball: How can we make it up to her?
Darwin: How about we just sit in the car, and do as she says for once?
Gumball: Nah, she'll be expecting that.
Darwin: I'm pretty sure she wouldn't.
Gumball: No! We need something big, something bold, something...
[Gumball sees a Mother's Day banner on a nearby car park. We then see Gumball and Darwin painting on it while on a lift]
Gumball: That should do it. [Reads painted message on banner] "You're Super, Mom. Happy Mother's Day. We're sorry."
Darwin: Dude, it says here this can only support one person.
[The lift moves]
Gumball: Eh, don't worry. I know exactly what to do.
[He starts jumping]
Darwin: What are you doing?!
Gumball: I figured that by jumping up and down, it's like I'm only half a person's weight.
Darwin: So if we both do it, [Starts jumping] it adds up to one person!
[The lift falls down to the street and both Gumball and Darwin scream as they hang on to the banner]
Gumball: How did that not work?
Darwin: Ah! We should've been jumping at the same time.
Gumball: Oh, yeah, that makes sense.
Darwin: What do we do?!
Gumball: What a real man does when he's in trouble. MOMMY! HELP! MOM! MOM!
Darwin: Dude, there's no point in screaming. Mom's at the mall, on the other side of the parking lot. She can't hear you.
Super Mom to the Rescue
Gumball: [Distant, from off-screen] MOMMY! HELP!
[Nicole is sitting at the salon, and suddenly she opens her eyes and gasps, hearing her son's cries for help.]
Nicole: Did you hear that?
Blue Elephant: Hear what?
Nicole: [Throws her sheet around her back into a cape] My kids are in danger. [One of her curlers pops out leaving a curl in her hair as she runs to rescue her boys]
Gumball: Told you we should've stayed in the car!
Darwin: Are you kidding me?! That's what I said!
Gumball: No, man. Aw, darn you past Gumball! [Smacks head] Why do I never listen?
Darwin: Well, as long as you learn from your mis--
Gumball: I wish I was a better listener!
[Darwin sighs; Nicole, now outside, jumps over several cars on her way to the boys]
Gumball: I think if I pull myself onto that ledge, then I can backflip over that railing then vault over to that open window. I know you're not as athletic as me, so just hang on in there, buddy. I'll come back for you. [Strains himself to get to the nearest ledge but fails]
[Nicole jumps over more cars]
Billy: Mother, look! Is it not a bird? Is it not a plane?
Felicity: [Looks in wrong direction] It's a plane, honey.
Billy: No, not that. [Points to Nicole] That.
Nicole: Hang in there, boys! [Jumps off car and lands before a security barrier]
Green Security Guard: Ma'am, you can't come in here. It's vehicles only.
Nicole: [Bends the gate] Sorry, my kids are in trouble. [Runs off just as the guard gets pinned against a wall by the bent gate]
At the Parking Lot
[Gumball and Darwin panic]
Nicole: KIDS! What floor are you on?
Gumball: [offscreen] It's about level 32!
[Nicole looks at a sign labeling her current floor as "3", making her sigh in exasperation and run up the stairs]
Darwin: Ahh, I'm sure one day we'll look back at this and laugh. [Banner rips] But not today.
[The banner tears and swings down to the car park's 16th floor, carrying Gumball and Darwin with it. But it stops as a crowd watches. Darwin then accidentally pulls Gumball's pants down, revealing his underwear, making the crowd react in disgust.]
Nicole: [Completely exhausted, having reached level 32] Kids, where are you?
Gumball: [offscreen] Mom, we're at level 16 now!
[Nicole sighs and heads down]
Gumball and Darwin: [In unison] MOM!
Nicole: Are you guys alright?
Gumball: I'm okay! But Darwin isn't as athletic as me, he won't be able to hold on much longer!
Nicole: Hang tight!
[She grabs a fire hose and ties it to her body just as the banner completely tears, leaving Gumball and Darwin screaming as they plummet towards the street. Nicole jumps off the nearest ledge, and the fire hose swings her down towards the boys. She successfully catches them and they swing down to the pavement while Gumball keeps screaming, unaware that he has been saved]
Darwin: Dude, we're okay.
Gumball: [Stops screaming] Yeah, yeah I know.
[The crowd cheers]
Nicole: Kids, that was very dangerous. I know you were just trying to do something special for me, but-
Gumball: But you proved you're the Superest Mom in the World.
Banana Joe: [To Barbara] You're the Superest Mom. At least in my heart.
Banana Barbara: No, you're the Superest Mom.
Tobias: And here's your Superest Mom card.
Jackie: Oh, thank y-
[Tobias proceeds to angrily tear up the card before his mom can take it]
Nicole: Now, kids, you really can do something for me.
Nicole: Help me to the car, I think I put my back out.
[The fire hose roller Nicole is tied to detaches]
Darwin: But you're a superhero.
Gumball: Yeah, you're invincible!
Nicole: Kids, for the last time I am not a superhero. I just did what any mom would do. Now, come on. Let's go home! [Gets hoisted upwards by the fire hose as if she were doing a superhero takeoff, just as the hose roller hits the ground]
Gumball and Darwin: Whoa...
[The hose roller crashes to the ground, episode ends]