Premiering back in the summer of 2012, Gravity Falls is loosely inspired by Alex Hirsch's childhood summers in Oregon and follows the adventures of fraternal twins Dipper and Mabel Pines (voiced by Jason Ritter and Kristen Schaal respectively) during their summer away from home at their Great Uncle Stan's (voiced by Alex Hirsch) in Gravity Falls, Oregon. Throughout the series, eclectic characters were introduced, including simple handyman Soos (voiced by Alex Hirsch) and teenage tough girl Wendy (voiced by Linda Cardellini), and a larger mystery spanning the entire series unfolded in a masterfully clever and teasing manner unlike anything seen in an animated series before. Through end credit cryptograms, witty writing, and blink-and-you'll-miss-it hints, viewers were enticed to continue to return to delve deeper into the mystery of Gravity Falls and discover the secrets that dwelled within.
It is important to note that Gravity Falls is not ending due to cancellation like many beloved past animated series have been known to meet their demise, but rather because this is the ending that Hirsch has been planning towards. This decision is best summed up by Hirsch who stated in his Tumblr post, "This is 100% my choice and it's something I decided on a very long time ago. I always designed Gravity Falls to be a finite series about one epic summer- a series with a beginning, middle, and end." This makes the ending of Gravity Falls unique as it was not a studio decision to end the series, but rather a creator decision.
As a series that was unafraid to push boundaries and delved into some dark subject matter with villains that did not follow previously established tropes (see Bill Cipher, also voiced by Alex Hirsch), Gravity Falls is one that will be remembered long after what is sure to be one wild and incredible finale. Be sure to tune into the final episodes to see how Gravity Falls and it's big mystery wraps up. You can view the promo for "Weirdmageddon II: Escape from Reality" below and check out Alex Hirsch's announcement post here.