Season 1 Episode 18 episode 18

'Once Upon a Time' Episode 18 "The Stable Boy" Sneak Peek 1

'Once Upon a Time' Episode 18 "The Stable Boy" Sneak Peek 1

ABC has released the first sneak peek for Sunday's episode of Once Upon a Time, "The Stable Boy". In the clip below, Mary Margaret is upset over her upcoming trial when Regina pays her a visit to relish in her impending revenge.