In his laboratory under the Mystery Shack, Stan rigs drums of chemical waste to power his machine. He sets a timer to go off in eighteen hours, at which time the machine will activate. During the activation period, temporary gravity anomalies occur as a side effect. The next day, Stan watches as Dipper and Mabel launch illegal fireworks off the roof of the shack. As the twins put out the fires they caused with a water balloon fight, law enforcement officers arrest Stan for stealing the chemical waste the night before. When child services take hold of Dipper and Mabel, the twins decide to clear Stan's name using footage from the shack's security camera of the night before.
As the twins are being driven off, Mabel distracts a nearby driver into road rage, sending the child services car off the road. The twins then head back to the Mystery Shack. Much to the twins' dismay, the videotapes prove Stan's theft of the chemical waste. Shortly after, Dipper finds a box of fake identity documents and clippings from newspapers reporting Stan's death. In the box, Dipper finds a password on a slip of paper. Mabel identifies this as a button combination for the shack's vending machine.
Meanwhile, Stan is being interrogated by Agent Powers. Stan asks for a phone call, which he uses to call Soos, and instruct him to guard the vending machine. A few hours later, a gravity anomaly occurs, which Stan uses to escape from the interrogation room. Outside, he pays a taxi driver to distract the agents, so that he can run back to the Mystery Shack.
Back at the Mystery Shack, Dipper and Mabel find the vending machine being guarded by Soos. During a brief fight, Dipper inputs the password, revealing the entrance to Stan's lab. Inside, Dipper is in disbelief that Stan was hiding the first two journals from him. He then puts the three journals together, revealing the blueprints to Stan's machine. Under a black light, a secret message reveals that the entire universe could be torn apart if the machine is fully activated.
Dipper decides to override the machine, but Stan comes in to stop him. At that moment, another anomaly occurs, causing everyone to levitate. Mabel makes it to the override lever as another anomaly occurs. Forced to decide between trusting Stan and stopping the machine, Mabel tearfully sides with Stan, enabling the activation of the machine and engulfing everything in a flash of light.
When the anomaly ends, Dipper, Mabel, Stan, and Soos are left unharmed. A mysterious figure comes through the machine's portal, and puts a six-fingered hand on the first journal, revealing himself to be the author. Stan then reveals that the author is his long-lost brother. The episode ends with a flashback of Stan and his brother as children, swinging on a swing set as they look out to the ocean, playing over the end credits.
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