What's cool in Gravity Falls?Well, they don't come much cooler than Coolio. He's just one of the special guest stars making an appearance in ace new animated adventure show, Gravity Falls.We caught up with show star Jason Ritter, who voices 12-year-old Dipper Pines, a young chap who finds himself embroiled in the mysterious goings-on of fictional town Gravity Falls. Get set for a new cartoon crush!