Is the first promo trailer for "Glee" season 6 a subtle way of telling the fans to start letting the show go? 

The very first video trailer for the upcoming final season of Fox's hit musical series shows Rachel Berry (Lea Michele) singing "Let It Go," the iconic anthem from Disney's "Frozen," while montages of the other members of McKinley High's Glee Club are shown. 

The two-hour season premiere of "Glee" season 6 reportedly focuses on Rachel and Kurt Hummel's (Chris Colfer) return to Lima, Ohio from New York to help bring back the fallen New Directions. But their mission is not easy since the always-ruthless Sue Sylvester (Jane Lynch) is out to make sure that they don't succeed. 

The McKinley High principal and former Cheerios coach even threatens Rachel and Kurt, saying, "You two have just entered Thunder Dome. You will beg for death." 

But Rachel and Kurt are not the only ones who are returning to their beloved high school, as the teaser shows Blaine Anderson (Darren Criss) also back from New York, singing with his original group the Warblers. Santana Lopez (Naya Rivera) and Brittany (Heather Morris) also return to McKinley High to show the present Cheerios members how they performed when they were the ones who were wearing the cheerleader's uniform. 

The brief 19-seconder promo video ended by showing the New Directions' former adviser Will Schuester (Matthew Morrison) giving Rachel some compliments to boost her confidence. 

Mr. Schue tells Rachel, "I've just always seen the best in you. I think you're going to like it here." 

This will be the sixth and final season for "Glee," which will air a total of 13 episodes before it finally wraps up next year. Other returning series regular characters include Coach Shannon Beiste (Dot-Marie Jones) and Amber Riley (Mercedes Jones). 

"Glee" season 6 will air on Friday, Jan. 9.