Chowder, Mung Daal, Shnitzel, and Truffles are making some Flam-O-Burgers. Mung tells Chowder that when two are touched together, "Kablooey!" It explodes the kitchen. Chowder doesn't listen and when he is about to put them together, Mung stops him and reminds him.
Mung tries to tell him how to make them, although Chowder doesn't listen because he "is so bored." Chowder then starts looking at two of the Flam-O-Burgers and imagining them getting married, and everybody screams (except Truffles) after Chowder says "You may kiss the Flam-O-Burger!" and touches two of the Flam-O-Burgers together. The whole kitchen explodes, and Chowder and Mung float up in the sky and land into the hospital in the middle of the night, with bruises and scratches.
Mung is telling Chowder that soon he and Truffles will retire and Chowder will be in charge of the Catering Company. Chowder tells Mung that the show Chowder is actually about him being an apprentice, and Mung nearly dies, and Chowder asks a doctor intern for help. Chowder objects, since being Mung's apprentice is what the show is about. He then goes into a musical number "I Don't Wanna Grow Up." He holds the end note for twenty years, which he never noticed. Then Chowder asks Mung if they're going to finish the Flam-O-Burgers, and Mung explains that they've already did that twenty years ago.
Then they decided to retire, but before they did that, and Mung then flies him-since "anything's possible in these thirty-minute specials" and shows him that by not growing up he made Panini and Gorgonzola jealous about getting married (Panini) and being his nemesis (Gorgonzola).
Then, Mung takes him to Gazpacho's store, which has closed down. A recorder plays a pre-recorded message in which Gazpacho tells about his future (which he actually just made up): he has become a successful ninja and finally gotten to date girls.
Chowder then tries to choose his new apprentice. After turning down all the eligible candidates, he finds a timid Scraps hiding in the corner (his real name is never revealed because Chowder decides to call him Scraps).
Mung then tells Chowder that he is ready to grow up. Then Scraps throws up (vomits) in his box and the part ends with Mung saying, "No, I said grow up, not throw up."
Chowder and Scraps try to make some food, but easily fail. Discouraged, Chowder, along with Scraps, flee Marzipan. They then get lost in the raging hot Shmahara Dessert, with no water or food, causing the two to faint.
However, Gazpacho finds them and takes them back to what he calls his 'Man Cave'. They come to, and Chowder is surprised to learn that Gazpacho actually wasn't successful: his mother wanted him to get a 'real job' like accounting, but since Gazpacho had trouble with math and was suffering from boredom, he failed and hid. Gazpacho wants to eat Scraps, but Chowder stops him. Gazpacho then asks Chowder to live in his Man Cave with him because he's lonely. Chowder doesn't, but instead just camps out with Gazpacho for the night. During this camp-out, Gazpacho tells Chowder that his real dream was to open a stand up comedy show/fruit stand(called the 'Fruit Stand-Up'). Chowder asks why he didn't do it, because it was the best idea Gazpacho has had to him. Gazpacho said that his mother told him growing up is about what's expected of you, not what you want to do. Chowder then says that maybe Gazpacho's mother is wrong, and convinces Gazpacho to feel the same way. Gazpacho then asks Chowder why he's running away- he says Chowder was "built to cook." Scraps joins in and says that Chowder has made cooking fun. For the first time in his life, he isn't scared. Gazpacho wonders who Scraps is and again asks if he can eat him. Chowder introduces Scraps, then states that he is his master and that they are now going to cook a dish together before the night is done. Chowder and Scraps then head back to Marzipan.
Chowder, now back in Marzipan, makes up a recipe with Scraps. The other characters are appalled at this. Scraps then tastes the food, and the others are shocked when he doesn't die after eating it. They then taste the food, too, and realize it doesn't taste bad at all.
The episode ends to reveal the other character's futures. Mung and Truffles are happily retired, Shnitzel starts to like being married to Endive, Gazpacho starts doing stand up at his new job just like in Gazpacho Stands Up, Gorgonzola gets to show Chowder just how successful he is to try to make Chowder jealous (the plan fails). And Chowder and Panini get married and have 50 babies together! Adult Panini and Adult Chowder are about to kiss, but kid Chowder appears, and says that he "rejects this future". Kid Panini shows up and tells Chowder they look happy together. Adult Chowder remarks that they were cute kids, then asks Adult Panini to stop having babies. The episode ends when Scraps is carried off by the babies and Chowder and Panini chase after them. Then the book that opens in each episode closes for the final time.
- Poland (25 June 2010)
- America, Italy, Turkey, & Greece (7 August 2010)
- UK & Ireland (September 2010)
- Latin America (11 November 2010)
- Japan (15 June 2013)
- This episode wasn't originally intended to be the series finale; it was in development before Cartoon Network relayed the news of Chowder being cancelled.
- Chowder was cancelled in favor of Destroy Build Destroy as they felt it didn't fit their older boy demographic.
- In the puppet sequence in the credits of this episode, Chowder implies the episode never actually happened.
- This episode may have a possible reference to the novel "A Christmas Carol" and the film "It's a Wonderful Life" when Mung flew Chowder around, showing how his refusal to grow up had affected his friends.
- This episode's first broadcast was on June 25, 2010 in Poland.
- Some of the main cast reprised their roles while it takes place 20 years into the future.
- Ceviche did not appear in this episode, although his actor voiced Scraps in this episode.
- When Gazpacho was in the Dessert, he was dressed similarly to a Tusken Raider from Star Wars.
- Chowder and Panini having 50 babies is a reference to a rabbit's huge reproduction rate.
- The song that Chowder sings near the beginning of the episode, I Don't Wanna Grow Up, is a parody of the Toys 'R' Us jingle from the 1980s and '90s.
- This is the first and only episode of Chowder to air during the Cartoon Network CHECK It era.
- After aging 20 years, Mung is missing the remaining hair on the top of his head, but when he finally retires, his hair is there again.
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