This will take place in he's not what he seems. I think I got the name right.
You went to the mystery shack bored out of you mind. Government vehicles pulled up around the shack. "This can't be good" you mutter and fly into a tree to hide.
You watched as Dipper, Mabel and Stan were taken into the trucks "this keeps getting worse" you flew after the truck that Dipper and Mabel were in soon losing site of it.
The Dipper summoned you he was in the forest with Mabel and in the distance was a crashed truck. "What the he'll is going on?" You asked. "Long story that we don't know the ending to" Dipper muttered "by the way can you teleport?"
You teleported everyone I side the shack. "We must check the security camras so we can prove that Stan's innocent" Dipper said you followed them. To (I think it was Stan's room?) Stan's room.
"I'll wait here make sure no one comes" you waited for about five minites before they came running out.
"To the vending mechan!" Mabel yelled. You ran after them. Zoos stood in front of it. "Leave it to me!" Mabel walked up to him and blew glitter in his eye while Dipper put in the code.
The vending mechan move showing a hidden elevator. You all took it to the third level. The you spotted the portal. "SHUT IT OFF"
"Wait!" It was Stan. Mabel and Dipper stood by the red button. "Shut it off I know where it leads" you said.
"You might want to hold on to some thing" Stan said. Mabel grabbed hold off where the button was but you and the other where lifted off the ground. Stan was pinned. And a rock fell on your wing trapping you.
"Mabel shut it off!" Dipper yelled
"Mabel trust me!" Stan yelledThere was 10 seconds left. "Grunkel stan" Mabel said "I trust you" Mabel let go and floated up.
"Mabel are you crazy? We're all gonna.." then the count down reached zero everything went white then normal. A figer came from the portal. You knew who he was. He picked up the journal and put it in his coat.
"Who is that?" Dipper asked. "The author of the journals" Stan awnsered "my brother"
"Is this the part were one of us faints?" Mabels asked Soos laughed "I'm way ahead of ya" the he fell to the ground.