“Gravity Falls” fans, mark your calendars. Disney XD has set Feb. 15 as the premiere date for the hourlong finale of the animated mystery comedy.

Creator/exec producer Alex Hirsch surprised fans of the highly rated toon in November when he announced that the current second season would be the last for the offbeat show.

“Gravity Falls” revolves around the adventures of 12-year-old twins Mabel and Dipper Pines, who are sent to live for a summer with their great-uncle Stan at the roadside attraction he runs in a small Oregon town. The twins stumble into a series of clues to a larger supernatural mystery that involves their beloved Grunkle Stan and a host of other colorful characters.

The penultimate episode, “Weirdmageddon Part 2: Escape From Reality,” aired Nov. 23. “Gravity Falls” has long had an unconventional scheduling pattern for its original episodes, with weeks and sometimes months between installments. The series’ first 20-episode season premiered in 2012.

The finale, “Weirdmageddon Part 3: Take Back the Falls” is penned by Hirsch and “Gravity Falls” vets Mark Rizzo, Jeff Rowe, Josh Weinstein and Shion Takeuchi, and directed by Stephen Sandoval.

A teaser for “Weirdmageddon Part 3” citing the Feb. 15 finale date hit Facebook and YouTube on Wednesday night but has since been made private. Disney XD confirmed the finale air date. Disney XD also confirmed Thursday that a half-hour special featuring “exclusive facts” about the mythos-heavy show will air Feb. 8, hosted by — SPOILER ALERT — the “Gravity Falls” character Time Baby.

Hirsch has so far kept mum about the finale air date on social media. But he has chronicled the show’s last steps in production, such as this tweet featuring a video clip of the final recording session with Kristen Schaal, who provides the voice of Mabel Pines. Jason Ritter, Linda Cardellini and Hirsch are among the other key voice cast members.

My TV sis @kristenschaaled reacts to hearing that she just recorded the very last Mabel line. I'll miss you Kristen! pic.twitter.com/sIyzW7DqC8 — Alex Hirsch (@_AlexHirsch) December 21, 2015

In announcing the series finale in November, Hirsch explained via Tumblr:

“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. This is very unusual in television and a pretty big experiment, and Disney for their part has been enormously supportive. I know that hits are rare in this business, and its hard to let one of them go, so I’m so grateful that this company has had the vision to let me start (and end) the show the way I always wanted to.”