Everyone in Gravity Falls celebrates the holiday like it is Halloween. They light up their jack-o-melons and dress in costumes, and they give out the candy to trick-or-treaters.
Mabel and Dipper were very excited to go trick-or-treating for their last year. But Wendy invited Dipper to Tambry's party and he said he wasn't trick-or-treating so he could hang out with her. Mabel, Dipper, Soos, Candy and Grenda were attacked by the Summerween Trickster and had to collect 500 pieces of candy by the time the last jack-o-melon went out.
Dipper refused to go trick or treating because he was "sick" but after a while, Mabel convinced him to put on his costume and get the most candy. After the group collects 499 pieces, Mabel overhears Dipper talking to Wendy and realizes that he was planning on going to a party. She was very upset with him and wouldn't talk to him.
Dipper put the wheelbarrow behind some bushes, unknowingly letting it fall into the creek behind the bushes. The trickster corners everyone in the Summerween Superstore and eats Soos. Soos eats the Summerween Trickster from the inside, revealing that the Summerween Trickster is made up of the unwanted candy from the town.
- The name is parody with the season, Summer, and the holiday, Halloween.
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