The short starts with Cloudy dressed up as a newscaster. He tells the viewers that "We have a breaking story tonight!" he introduces Yellow Face into the broadcast as a salesman. Cloudy tells that Yellow Face is here to tell his story of his Halloween from 8 years ago. Yellow Face talks about Halloween from 8 years ago and how "they" glued his mouth shut, and threw pumpkins at him. He asks "Do you want to know the worst part?" as a "hook" that sellers usually use to get people's attention. He immediately changes to a happy mood, then starts advertising his "PUMPKIN 2.0". While Yellow Face is talking about PUMPKIN 2.0, the screen shows that a hand is placing a candle to inside of the Pumpkin while it reveals Marker was doing it. When the PUMPKIN 2.0 shows up, Marker has a surprised face. Then, while Grassy and Pie are Trick or Treating, Marker shows them the PUMPKIN 2.0, it shoots lasers at Pie and Grassy, and it sends them to another sovereign territory. They fall down in front of a house and open their bags for candy. Lightning opens the door and acts confused because he doesn't celebrate Halloween. It then shows that Remote and Golf Ball are having a Halloween rave party (Possibly with everyone from BFB and TPOT in the party but Cloudy and Yellow Face) on the Pillary Ruins and Remote says that she ranks the PUMPKIN 2.0 a 4 stars while saying it was "very pumpkiny" while Golf Ball corrects her with "very *pumpconic". And, Firey, who said that it was "Quite possibly the strangest-tasting watermelon I have ever eaten", rated it 0 stars. Then it cuts back to Cloudy, who says "This wasn't what we were expecting-" and Yellow Face gets in front of Cloudy and he interjects with "Doesn't matter, PUMPKIN 2.0."
Pencil judges the best Halloween costume of Bubble, Ice Cube, Ruby, Dora and David. Bubble's is an acid bubble, which is rated 3; Ice Cube's is a Dice, which is rated 1; Ruby wears toilet paper on her head and purple (Yoyleberry) and orange liquid (Tangerine Juice), which is rated 4. Finally, David and Dora seemingly don't have costumes, so Pencil rates them 0. Then David turns out to be Dora in disguise and walks away angry, and David with a Dora wig says "Aw, seriously?".
Leafy dressed as a Witch and holding a bag knocks on Four's house door, then she knocks again and when no one answered yet she knocks again but angrily, The door opens and Four's hand grabs Leafy and takes her inside, while Leafy is screaming. The hat falls outside and a text saying "Happy Halloween" fades in.
Leafy dresses up as a football and says hi to Firey, who asks who she was. Before she could say that she was Leafy, Blocky kicks her over a goalpost.
Gelatin, Loser, Spongy, Leafy and Pen went to trick or treating as they head to Book's House. Book grabs a bag and puts it something special. After a bit the group leaves and Loser tells them of what did they got. Leafy got Lollipop, Donut, who came out of Spongy's bag seems angry and he asks why Book is using contestants as treats for Halloween, while Fries, who came out of Gelatin's bag slaps Gelatin before Gelatin gets Fries' fries. When Loser asks Pen what did he got, Pen tolds and reveals that he got Rocky and Rocky vomits on Pen. This short used BFDI assets.
Woody and Leafy are taking a walk and Blocky spies them in a bush. Then Blocky puts on a "scary" mask and tries to scare Leafy and Woody. When Woody and Leafy look at Blocky with a seriously face, Blocky takes off the mask and Woody and Leafy run away scared. Then a sad/depressing music plays as the camera stays on Blocky.
Cloudy and Golf Ball are talking about the oldest BFDI Firey animation before the real BFDI Canon started. Golf Ball talks about how we may not go trick or treating in 2020 but that they should admire how far Firey went to open one candy bar, with him almost getting crushed by a boulder in the process. Golf Ball then says that we should all do our part and stay away from trick or treating this year. Yellow Face interrupts and promotes PUMPKIN 2.0 again and Golf Ball makes random sounds offscreen.
Teardrop was walking to a lake as she eats her cake while a Fish Monster was swimming towards Teardrop as Teardrop panics. The Fish Monster jumps out of the water and it turns out that the fish grabbed Teardrop's Cake instead of her, and the Fish Monster eats the cake. Teardrop got mad at this.
The video references a 2012 video made by jacknjellify called "Happy Halloween".
This short was premiered a day before Halloween (October 31st).