Meet Ricky, Mabel, and Dipper Pines! Three siblings looking to just hang out during the summer with their great uncle Stan in a little town called Gravity Falls! Let's hope that nothing too crazy happens!
We open with Dipper sleeping. But, suddenly he wakes up and screams. He looks up and sees his little sister with goo-goo-eyes on her chin.
Mabel:"Mornin', Dipper, guess who!"
Dipper:"Oh, what joy. If it isn't Mr. Upside-Downington. How long's it been? Third grade, maybe?"
Mabel (Mr. Upside-Downington):"That's right. And I'm here to deliver you an upside-downington-tastic message!"
Dipper:"Is it the message that we're getting too old for this sort of thing?"
Mabel:"Um, kinda, actually. It's that we are exactly one week away from our 13th birthday and our brother's 16th birthday as well!"
She points to a calendar which has the three headshots of their bodies with the exception of Dipper and Mabel having adult bodies.
Dipper:"Whoa! Our birthday's coming up already? Soon we're gonna be actual teenagers with Ricky!"
Mabel:"Finally! I can stop reading preteen magazines and start reading post-preteen magazines."
Dipper:"PG-13 movies, here I come!"
Mabel:"And just one more year until high school. High school, Dipper! Where girls become women and they teach us stuff about...You know what."
Dipper:"Trigonometry?"
Mabel:"Oh yeah, baby! And best of all, we'll be with Ricky during his Senior year!"
Stan and Soos enter the room.
Stan:"That's not the only good news coming up! In one week my senior citizen's ponytail kit is coming in the mail. I'm...I'm kinda going through some things."
Soos:"In one week, my grandma is finally letting me eat crackers on my bed! The future is coming for us all, dudes."
Stan:"The future."
Dipper:"The future!"
Mabel:"The future!"
Dipper:"I'm sorry, I can't take you seriously with that face on your chin."
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Dipper:"You're--You're doing the voice so you obviously know what I'm talking about--"
Mabel:"Bi bon't bnow bhat bou're balking about."
Dipper and Mabel laugh at each other.
Dipper:"There is something wrong with you."
Mabel:"There's something wrong with both of us."
A couple hours laters in the living room of the Mystery Shack, Mabel is instructing her family.
Mabel:"Alright, party planners. In one week we become teenagers, and our summer vacation winds to an end. So we need to throw the greatest party of all time! I'm talking piñatas with tinier piñatas inside."