The musical composer on ABC's Once Upon a Time has revealed the title of the season 5 premiere.

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Mark Isham, who composes the music for the ABC series, took to his Instagram account Tuesday to reveal the season 5 premiere episode title. The premiere is titled The Dark Swan. It will be written by Edward Kitsis and Adam Horowitz and directed by Ron Underwood.

A photo posted by Mark Isham (@markisham) on Jun 30, 2015 at 7:10pm PDT

The title suggests that the show will be delving into Emma Swan's (Jennifer Morrison) new darkness right away. As fans last saw in the season 4 finale, Emma sacrificed herself by letting herself be enveloped in darkness. She was last seen disappearing into the darkness, with only the dagger left behind, this time with her name written on it.

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As TVLine reported this week, the season 5 premiere will be picking up right where the season 4 finale left off.

Meanwhile, the series has gone through a few casting changes between season 4 and 5. Michael Socha, who played Will Scarlett, will no longer be a series regular. The actor joined the series in season 4 after starring in spinoff show Once Upon a Time in Wonderland.

Two previously recurring characters are being promoted to series regular status. Sean Maguire, who plays Robin Hood, and Rebecca Mader, who plays Zelena, will be part of the main cast in season 5.

Once Upon a Time season 5 will premiere Sunday, Sept. 27 at 8 p.m. ET/PT on ABC.

Tags: Once Upon A Time television ABC