Snow White are Prince Charming must make a decision about the fate of their unborn child in a fairy tale flashback on Once Upon a Time. "Best Laid Plans" is the 17th episode of the show's fourth season.
What has Mary Margaret and David searching through the tunnels of the mine? We're betting it has something to do with the newest residents of Storybrooke, Cruella de Vil and Ursula.
With the spell of Shattered Sight about to take over, we'd say Mary Margaret didn't know what she was getting in to when she decided to become Mayor, but magical spells happen every other week in Storybrooke.