Disney launched a surprise for fans with a teaser trailer for a two-hour Star vs. The Forces of Evil special to air on July 15 called The Battle for Mewni. The special will pick up from where the series second season ended as Star Butterfly is forced to return to her home dimension of Mewni to face the seemingly immortal villain Toffee, who has a dark connection with her mother Moon.
According to ComicBook.com, the special will air three times on July 15 at 11am, 2pm, and 7pm EST as well as be available on the Disney XD app and VOD platforms. The special airs ahead of the much-anticipated third season of the series, which is project to premiere in the Fall.
UPDATE: Series creator Daron Nefcy posted an interesting tidbit on her Twitter account regarding The Battle of Mewni special.
I just want to be clear that the movie is the 1st 4 episodes of S3 played together. It will play like a movie but it is the premiere of S3.
— Daron Nefcy (@DaronNefcy) May 26, 2017