The episode begins with Gumball and Darwin in the school bus going to school. Gumball asks Darwin what he wants to do after but Darwin cannot make a decision and says that he is bad at making decisions leading to a flashback where Darwin can't decide on a signature when he's given a card to sign for Teri. Gumball thinks that making decisions is easy and tells him to use his brain. Darwin says it's busy so Gumball says that he can go on like that or he could let him make the decision for him. Darwin hesistates to answer so Gumball says he's decided.
One week later, Gumball thinks it's going well but Darwin says all his decisions have gone wrong. Gumball gets off the bus and Darwin says he's not going to take his advice anymore. Gumball tells Darwin to get off the bus but Darwin says no. Darwin then gets squashed and then says from now on he wont take any of his advice and he'll get it from somebody else.
In the cafeteria, Darwin decides who to pick for his mentor. He doesn't think Tobias, Banana Joe and he doesn't know Gregory but then he sees Alan who is teaching kids why they should eat vegetables and picks him. Then, they go and make good decisions. Carrie is better after Darwin apoligises to Carrie after a bad date. Principal Brown says that Darwin has made the best solar sytem diorama he's seen all year. Hexagon Lady thanks Darwin for calling the pest control and Darwin says it was Alan's decision for Darwin to call them rather than saving the dog himself. Again, Doughnut Sheriff thanks Darwin for calling him so he was able to catch Sal Left Thumb and Darwin says it was Alan's idea. Teri thanks Darwin for the best meringue she's ever had but she then asks him if he's ok as Darwin is floating, has a high-pitched voice and thicker eyelashes, Darwin says he's fine and never felt better.
Gumball appears angry as Darwin has decided to chose Alan as his mentor. Darwin asks him to join them but Gumball says why he should do so. Darwin is confused and Gumball says that he's "turning into him" and then "deflates" Darwin. Darwin says he's making better decisions but Gumball says that he's just doing what Alan says. Alan then whispers to Darwin what he should say and when he realises he gets sad and runs away. Gumball thinks it went well but Alan disagrees. Alan goes off to find him but Gumball thinks he's going in the wrong direction. Gumball bumps into to Teri and tastes them saying they are good meringues.
Darwin is in the mall trying to make a good decision and Jared tells him he should get a burger for half off. Darwin is happy that he had made a decision but then is sad when he realises he is doing what Jared just told him to do. He goes to the burger stand and asks for a burger. Larry asks which one and Teapot tells Darwin he should get slawcrine so Darwin agrees and gets it. Then, Larry asks if he wants to go large and Darwin doesn't know. Other people in the line fight other what what size he should get and then Marvin gets knocked over and makes payphones fall down squashing Banana Barbara and making her fly into Coach's mouth leading her to break the escalator. Darwin stands there hesitating on what to do. Gumball and Alan find Darwin and Alan tells Darwin to leave but Gumball tells him to stay. However, he unintentionally takes Gumball's advice as Doughnut Sheriff locks the exit. At one point, Tony gets pushed onto Siciliana and eats one of her pepporinis which makes Quattro angry and punches him, breaking a pipe. The pipe bursts out with water and floods the center of the mall. Alan tells Darwin to get to higher ground whilst Gumball says to sing a song. A boat goes next to Darwin and tells him to get on but then Banana Bob tells Darwin to get on an arcade machine that is on fire. Gumball and Alan argue again about what he should go on. Gumball says to "tie a knot in it" meaning to stop giving bad advice but then Alan goes and blocks the pipe with his balloon nob. Unfortunately, Alan starts filling up and Gumball tries to push the water back into the pipe but he gets stuck.
Darwin then tries to help. He asks Larry how to stop this and he says that Darwin needs to go in the basement. Darwin thanks him and swims away but Larry asks him if we wants to go large or not. Darwin is at the basement and is given a choice to go left or right. He goes left but it's a dead end so he ends up going right. He finds a door but it is locked. He then, finds an axe in a glass case and uses it to knock the padlock off. Inside, there is a wheel that Darwin struggles but then eventually turns a wheel. Gumball gets trapped in Alan but then he says it's stopped and Gumball puts his thumbs up. Darwin then pulls him out and Gumball congrtaulates Darwin for making a good decision. Gumball and Alan argue about how drain the water from the center of the mall but Darwin goes down and moves the plug in the water fountain and all the water drains. Then, Darwin goes back up and tells them. Alan then asks about himself and Gumball says he can do this. He pulls out his claw and pops Alan which Alan doesn't want. Water shoots out of the mall and knocks the cops over.
Gumball, Darwin and Alan go and get ice cream. Gumball orders three chocolate, but Darwin wants a strawberry instead. Larry says they're out of it so Darwin just has chocolate.
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[Episode starts on the school bus.]
Gumball: So dude, what do you wanna do after school? TV, or go to the mall?
Darwin: I don't know. You know how bad I am at making decisions. I haven't even decided on a signature!
[Flashback to Miss Simian's classroom. Carmen approaches Darwin, holding a pen and a card.]
Carmen: Hey, will you sign Teri's birthday card?
Darwin: Uh, sure! [He signs, but is unhappy with the result, so he crosses it out and signs again, but doesn't like this one either.] Mmh, no. [He tears up the card. Carmen gasps in dismay. Back to reality]
Gumball: Making decisions is easy. Just use your brain! I mean, what else is it doing?
[We see Darwin's brain, frantically checking boxes on a clipboard.]
Gumball: Well, you can either go on like that, or you can let me make all your decisions for you!
Gumball: It's decided, then!
One Week Later
[A week later, the brothers are on the school bus again.]
Gumball: It's going pretty well, don't you think?
Darwin: [with his head on fire] Really? [Gumball blows out the flame] You said it would be better for the environment if I chewed on sugar cubes instead of gum!
[Flashback to a group of firefighters attempting to pry a crazed Darwin from his desk. Some students watch, confused.]
Darwin: I CAN TASTE SOUND!
[Back to reality]
Gumball: What about your date with Carrie?
Darwin: Rather than express my feelings, you said I'd seem more cool and mysterious if I answered every question with a question!
[Flashback to Darwin and Carrie at the movies. Darwin holds an uneaten hot dog.]
Carrie: Aren't you gonna eat that?
Darwin: Aren't you?
Carrie: Um, no! You know I can't eat stuff!
Darwin: Do I?
Carrie: Well, you should do! I'm your girlfriend!
Darwin: Are you?
[Carrie moves the hot dog and uses it to slap Darwin's face. Back to reality.]
Darwin: And the perfume I got Teri for her birthday? I wanted to pack it with bubble wrap! But you said...
[Flashback to Darwin, Masami, Alan, and Bobert celebrating Teri's birthday.]
Darwin, Masami, Alan, and Bobert: Happy birthday to you, happy birthday to you...
[Teri opens her gift from Darwin. It's a perfume bottle, packaged in paper shreds. Teri inspects the paper closer, and gasps in horror.]
Darwin, Masami, Alan, and Bobert: Happy birthday, dear Te.....ri......
Teri: Uncle Brian.....? AAAHHHHH!!!!
[Back to reality. Everyone gets off the bus.]
Gumball: Well, I was only trying to help.
Darwin: Well, I've had it with your advice and I'm not gonna listen to you anymore!
Gumball: Uh, dude, I suggest you get off the bus.
Gumball: Before the doors close.
Darwin: [with his face smooshed between the doors] Okay, but from now on, I'm gonna get my advice from someone else!
[In the cafeteria]
Darwin: [To himself] Hmm....who to choose?
Tobias: [Walks by, with Masami and Carmen] Ladies, the equator called! It wants his hotness back. [The girls are unimpressed] From me. Because I'm hot. [points to Carmen] For you. [points to Masami] Or you.
Masami: Tobias, you don't have enough respect for girls!
Tobias: [leans on Carmen] Heh! Sure I do!
Masami: You're literally leaning on Carmen.
Tobias: Aahh!! [Upon realizing this, he jerks his arm away, and pulls the spines out of his arm.]
Darwin: [To himself] Mm, too slimy. What about Joe?
Banana Joe: Hey, everybody! Watch this!
[He throws his peel into the ground, and with a running start, slides on it like a sled. He crashes into the trash can, and falls in. Rocky notices his peel on the ground, and throws it in, empties the trash, and replaces the trashcan liner.]
Banana Joe: [from inside the trash bag] Ta-da....
Darwin: [To himself] Nah, too.....weird.
Gregory: Hey! Want to check out the new milkshake place after school? You know your boy Gregory's all about his milkshakes!
Darwin: [To himself] Who even is that guy? [walks in the other direction] Wait!
[Suddenly he sees the perfect mentor: Alan. Sparkles appear around him and high-pitched music plays.]
Darwin: Of course! Alan!
[Alan is sitting with a group of daycare kids.]
Little Timmy: Why can't I eat chocolates instead of vegetables?
Alan: Because, sweet child, chocolate is fun for a treat! But vegetables are the...[tries to shove an entire eggplant up his knot] CORNERSTONE OF A HEALTHY DIET!!! [panting] And are very important! And you need to [keeps shoving] MAKE SURE YOU EAT AT LEAST FIVE A DAY! [The eggplant finally goes through] Heh-heh...delicious!
Peggy: If you were talking while while you were eating, [Alan gets a little nervous] then where did the--
Darwin: Hi, Alan!
Alan: How can I help, Darwin?
Darwin: Alan, you seem to have it all figured out. Could you help me make the right decisions?
Alan: Of course! I'd be delighted to!
Peggy: [holds out a pineapple] Isn't fruit one of your five-a-day too?
Alan: [pushes her away] Ah-hahahaha! Anyway, Darwin, let's get out there and start making some better decisions!
[A few days later, in the hall. Darwin is walking with Carrie.]
Carrie: It was so refreshing you just straight-up apologized to me. [Alan passes by and shoots Darwin a wink. He winks back, with a thumbs-up.] Normally, you'd try some kind of harebrained scheme to win my heart back. You're definitely making better decisions. [They pass by Leslie and Carmen, who both smile at him.] And I think everyone's starting to notice-
[Cut to Principal Brown, evaluating Darwin and Alan's science fair project.]
Nigel Brown: Uranus, and Neptune. Well, that's the best solar system diorama I've seen all year. Well done, Darwin. You boys remind me of myself when I was a-
[Cut to Hexagon Lady with her dog, who was just saved by Darwin and Alan.]
Hexagon Lady: DISGUSTING VILE SEWER RAT! But little Wolford chases anything. I'm just glad you saved him.
Darwin: Thanks, Mrs. Lady! Alan advised me to call the relevant authorities rather than go into the drain myself! He's the real hero!
Hexagon Lady: I never said you were a hero. But still, I'm very grateful. All I can say to you is-
[Cut to Doughnut Sheriff arresting Sal Left Thumb.]
Doughnut Sheriff: EAT IT, GREASEBALL!! [to Darwin] Son, we couldn't have done it without you.
Darwin: Thank you, officer! Rather than trying to take on the criminal myself with an elaborate scheme and accidentally joining his gang in the process, Alan told me to just call you!
Doughnut Sheriff: I didn't ask, but I'm sure the mayor will invite you to City Hall so you can both be-
[Cut to Teri, holding a meringue.]
Teri: Whipped....to perfection! Thank you, Darwin! This is the tastiest meringue I've ever had! [She hugs him, but he stretches like a balloon when she does.] You okay? You don't seem yourself.
Darwin: [In a helium-filled voice] I'm fine! [We then see he is hovering a little off the ground.] In fact, I've never been better! See you later! [He and Alan float over to Gumball.]
Gumball: Well, looky who's made a decision about who's going to make their decisions!
Darwin: [Still in his helium-filled voice] Hello, Gumball! Won't you join us?
Gumball: Really? Join Head Zeppelin and his airhead puppet?
Darwin: What do you mean?
Gumball: Come on, look at you! You're turning into him! [He lets out Darwin's air, and Darwin floats back to the ground.] And I don't even wanna know how you got inflated in the first place.
Darwin: [Back in his normal voice] But I'm making good decisions now!
Gumball: No, dude! You're just doing whatever he says!
Darwin: That's not true!
Alan: [whispers to Darwin] I'm making all of my own decisions.
Darwin: I'm making all of my own decisions!
Alan: [whispers to Darwin] All on my own, without any help from anyone else.
Darwin: All on my own, without-[gasps] You're right! I'll never be my own person until I start making decisions for myself! [Runs off crying]
Gumball: Huh. That went pretty well, don't you think?
Alan: Uh, no! He ran off crying!
Gumball: Well, like I always say: you gotta break them down to build 'em back up again. Than you break 'em down again, and then you build 'em up again! Then down again, then up again, then it's down, down, up, up, down, up, then all the way up, and then a little bit down and then you're done!
Alan: That sound like a cheat code for being a terrible friend. Come on. We better go find him! [Floats off]
Gumball: Oh, you would go that way, wouldn't you? Well, I say we should go this way-[Walks off the other way, but collides with Teri. Her meringue flies into the air and splatters on them both.] Ugh! [He tastes some meringue.] Darn it. They are good meringues, though.