Complete story — includes the ending
Gideon swindles the Mystery Shack away from Stan, so the Pines are forced to move in with Soos and his grandmother. After being unable to sway the public from Gideon's charm, and unable to defeat him with help from the gnomes, Dipper and Mabel are sent back home. However, after Gideon gets ahold of Dipper's journal 3, realizing there is one more missing alongside his journal 2, he attacks them using a giant mech of himself. The twins defeat Gideon, and Stan exposes him as a fraud, as he is arrested, the townspeople turn against him, and the Mystery Shack is returned to the Pines. Afterwards, Stan gets his hands on the two journals, revealing he's had the first one all along, and prepares to activate a portal hidden in the shack's basement.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Gravity Falls season 1. HTML formatting and reference markers removed. · Content license