The Dark Swan rises!

Things go topsy-turvy on Once Upon a Time's fifth season when the Savior becomes the heroes' biggest foe. Emma (Jennifer Morrison) took one for the team and is on the path to becoming the Dark Swan. This leaves her friends and family scrambling to save her, and this will cause them to cross paths with Merida (guest star Amy Manson) and the whole gang in Camelot.

Here's everything else you need to know about Once Upon a Time Season 5:

Once Upon a Time Season 5 brings on the Dark Swan!

Once Upon a Time sneak peek: Emma faces off with Merida!

Henry gets a quest (and romance!) on Once Upon a Time

An LGBT romance is coming to Once Upon a Time! Will Mulan finally find love?

At long last, Mulan is back on Once Upon a Time

Something to howl about! Ruby is returning to Once Upon a Time

Once Upon a Time cordially invites you to a royal ball

Will Merida be Brave enough to help Emma on Once?

Once Upon a Time: Get your first look at the Dark Swan and Brave's Merida

PHOTOS: Scoop on all your favorite returning fall shows

Once Upon a Time has found its Merlin and Guinevere

Meet Once Upon a Time's King Arthur

Yes, Please! More Robin Hood and Zelena are coming to Once next season