"CLARA!" the Doctor yelled from across the TARDIS controls. Sparks were shooting everywhere as the TARDIS shook and rumbled. "SHE'S GOING ON HER OWN! WE MAY BE IN FOR TROUBLE!"

Clara screamed as the seismic motions of the TARDIS flung her uncontrollably. "DOCTOR WHAT IS IT DOING?"

The Doctor grabbed a hold on a lever and pulled it as hard as he could. "LOOKS LIKE PARIS HAS TO WAIT! WE'RE ON A DETOUR!"

The TARDIS began to whoosh as the shaking began a patter of increasing and decreasing as they materialized. It slowly began to settle again, and Clara stood up and adjusted her hair and jacket. Then she walked over to the Doctor who was doing a quick check over the TARDIS.

"Blimey, what the hell was that?" Clara asked, trying to catch her breath.

"See, Clara, every once in a while the TARDIS decides where we go. It's pretty hard on her, but it's where we need to be, according to her," he said, popping his jacket into place.

"What's out there?" she asked, nervously excited.

"I guess we should find out." he said, walking over to the doors. Genuinely interested, as always, the Doctor slowly opened a door and took a glimpse outside.

He looked out, and saw a shabby-looking building nearby. Big letters on the roof spelled out "MYSTERY SHACK". The Doctor slammed the door shut immediately.

"What is it?" Clara asked. The Doctor said nothing. He rushed back to the controls and furiously tried to make the TARDIS leave. But it refused.

"Doctor, where are we?" Clara asked, more nervously this time, because she knows the Doctor would never leave someplace. At least, the Doctor she used to know.

He gave up on trying to get out of there. He slammed his hands down on the controls in frustration.

"Gravity Falls."

"Dipper, I swear! It wasn't the wind! You've been seeing crazy things all summer, but you don't believe this?" Mabel practically yelled at Dipper.

"Mabel, I'm not saying I don't believe you, it was just a 'What If' sort of thing. I'll go check the journal for anything that... whooshes." Dipper said, pulling out his journal. As he flipped through with the black-light, Mabel ran over and looked out of the window.

She was shocked to see a blue box just next to the forest.

"Dipper!"

"Mabel!" Dipper yelled at the same time.

"Dipper, there's a weird blue box outside!" she said.

"Does it look like this?" he asked, holding up the journal with the black-light.

The journal had a black-light drawing of a police box. Next to it, the author had written, TARDIS and the Doctor. TRUSTWORTHY, BUT A FORESHADOWING OF SOMETHING BAD.

Mabel looked up at Dipper and nodded. Something terrible was about to happen in Gravity Falls.