It's time to say goodbye to Gravity Falls, once and for all.

'Girl Meets World' Season 3 Episode Titles Announced! Premiere Scoop

The Disney XD series will air its final hour on Feb. 15, but first, fans will be treated to the marathon to end all marathons. At 68-hours in length, the send off will lead directly into the events of "Weirdmageddon 3: Take Back The Falls."

Clocking in at twice the length of a standard Gravity Falls episode, the series finale will see Ford uncover Bill's true motives before a "a final confrontation with Bill leads to the Pines family's ultimate fate and greatest sacrifice."

'Shadowhunters' Premiere: Vampires, Silent Brothers, Oh My! Episodes 2 & 3 Plots Revealed

The massively popular series is only in its second season, but series creator Alex Hirsch chose to bring a definitive end to the story before the plot has the chance to fizzle out.

"I always designed Gravity Falls to be a finite series about one epic summer- a series with a beginning, middle, and end," Hirsch explained. "There are so many shows that go on endlessly until they lose their original spark, or mysteries that are cancelled before they ever get a chance to payoff. But I wanted Gravity Falls to have a mystery that had a real answer, an adventure that had a real climax, and an ending that had a real conclusion for the characters I care so much about."

But never fear, Gravity Falls will live on long after the credits roll on "Weirdmageddon 3: Take Back The Falls." The Gravity Falls: Journal 3 will hit shelves this July and an interactive game titled Gravity Falls: Take Back the Falls will be available on WATCH Disney XD this February.

Catch the Gravity Falls series finale Feb. 15 at 7 p.m. ET on Disney XD.

Tags: Gravity Falls television Disney XD