"Dipper and Mabel vs. the Future" is the 17th episode of the second season of Gravity Falls and the thirty-seventh episode overall. It premiered on October 12, 2015.
Dipper and Mabel are on the verge of turning 13, so Mabel decides to plan for the party - and Dipper is about to uncover a shocking secret beneath Gravity Falls.
- It is revealed in this episode that Dipper and Mabel's birthdays are on August 31.
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