Gideon Rises

It originally aired on the Disney Channel on August 2, 2013, and was directed by John Aoshima and Joe Pitt, and written by series creator Alex Hirsch, Matt Chapman, and Michael Rianda.

Meanwhile, at the Shack, Gideon reveals to his father, Bud, the true nature of his book; the story reads that it was written a long time ago by an unknown author who learned the secrets of Gravity Falls and hid the journals where no one could find them, knowing that when the journals are brought together, it will lead to "a gateway to unimaginable power".

Meanwhile, Dipper and Mabel are told by Stan that they are heading on the next bus out of Gravity Falls and back to their parents in Piedmont, as he is unable to watch over them.

Believing that Dipper is keeping the first one as well and trying to get it out of town, Gideon takes a giant robot look-alike made by Old Man McGucket and goes after their bus.

However, during the fight, the robot loses balance and falls off the bridge, but Mabel and Dipper are saved by the former's grappling hook, and the latter retrieves Journal 3.

As the police prepare to arrest Dipper and Mabel for this, Stan shows up and reveals Gideon's deception; Gideon had been using cameras hidden inside the pins he had handed out to the townsfolk at the press conference in order to spy on them (hence his "psychic abilities"), which Stan had figured out due to his hearing aid picking up the feedback.

Later that night, Stan, revealed to be faking his disbelief, takes the third journal and later opens a hidden passage door behind the Shack's vending machine.

"Gideon Rises" premiered on the Disney Channel on August 2, 2013, as the final episode of the first season of Gravity Falls and received a viewership of 3.2 million and a 0.5 18-49 rating in the United States.

Alex Hirsch nails Stan's reaction to being presented with Dipper's journal, as he can't quite mask his initial, genuine excitement before returning to his oblivious disguise.