Once Upon a Time 100th Episode Sneak Peeks: Souls of the Departed

The 100th episode of Once Upon a Time will air this Sunday, and ABC has released 2 more clips from it.

In the first clip, "the heroes make their way to the Underworld, which looks eerily similar to Storybrooke." In the follow clip, Mary Margaret—on a search for Hook—"goes to Granny's in the Underworld and bumps into James, David's brother."

Watch the sneak peeks in the videos below.

Emma, Regina, Mary Margaret, David, Robin, Henry and Gold arrive in the Underworld, on a mission to rescue Hook, only to discover that their search will be more difficult than they had anticipated. The inhabitants of the Underworld—all souls with unfinished business and many with quite personal vendettas—hound our heroes at every turn.

"Souls of the Departed" episode of Once Upon a Time will air Sunday, March 6 at 8PM on ABC.