Gravity Falls' Alex Hirsch Explains Plans for Dipper and Mabel's 13th Birthday

Gravity Falls creator Alex Hirsch can

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The Final Countdown: Number 1: Gravity Falls: “Dipper and Mabel vs. The Future”/”Weirdmageddon Parts 1 and 2” – yahoo201027

Gravity Falls Is About the Friendship Between Dipper & Mabel

The Final Countdown: Number 1: Gravity Falls: “Dipper and Mabel vs. The Future”/”Weirdmageddon Parts 1 and 2” – yahoo201027

Fordtato — We interviewed Alex Hirsch!

Lw lv kdsshqlqj djdlq: Let's rewatch Gravity Falls! - The Something Awful Forums

Is it me or does Gravity Falls have some dark concepts? - Quora

Celebrating 10 Years of Gravity Falls — The Geeky Waffle

Alex Hirsch - Animator, Producer, Writer, Voice Actor

Double Dipper, Gravity Falls Wiki

Dipper and Mabel vs. the Future, Gravity Falls Wiki