Mason "Dipper" Pines [1] is a fictional character and the protagonist of the Disney Channel animated series Gravity Falls. The character is voiced by Jason Ritter , and designed by and loosely based on the childhood of series creator Alex Hirsch. Dipper is a year-old boy who, along with his twin sister Mabel, is sent to spend his summer vacation in his great uncle's tourist trap , "The Mystery Shack". He endeavors to uncover the secrets of the fictional town of Gravity Falls and to find explanations for assorted strange situations. He is helped by his energetic and boundlessly cheerful twin Mabel and the Shack's handyman Soos.