Regina is forced to choose between her true love and her mother in the fairytale land, while Mary Margaret insists she's innocent in the murder of David's wife in today's world.
Mary Margaret will stay behind the bars in the next episode of "Once Upon a Time" while Emma continues her exhaustive search for evidence that will prove her innocence. Merciless Regina, however, claims Mary is a liar and a murderer who deserves to serve her time in jail.
In the fairytale land that was and before evil blackened her soul, Regina must choose between marrying for true love but betraying her mother Cora, and betrothing royalty to live a regal but loveless life. Also in the upcoming outing, the event that caused the Evil Queen to loathe a little girl named Snow White is revealed.
"The Stable Boy" will air Sunday, April 1 at 8/7c on ABC. Barbara Hershey will guest star as Regina's mother.