• Actors Ginnifer Goodwin and Josh Dallas (R) from the TV series "Once Upon A Time" arrive at the 15th Annual Costume Designers Guild Awards in Beverly Hills February 19, 2013.

Actors Ginnifer Goodwin and Josh Dallas (R) from the TV series "Once Upon A Time" arrive at the 15th Annual Costume Designers Guild Awards in Beverly Hills February 19, 2013. (Photo : REUTERS/Fred Prouser)

"Once Upon A Time" (OUAT) Season 4 is set to feature a segment that will reveal Emma Swan's fate. Episode 17 is titled "Best Laid Plans" that will take fans back in time where Snow White and Prince Charming are compelled to take some hard decisions. Here are few spoilers for the next episode of "Once Upon a Time" Season 4. Read on to find out what's in store for Emma.

Like Us on Facebook

[Warning: Spoilers Alert! Read only if you want to learn more about it.]

Snow White and Charming's past catches up with them. Episode 17 "Best Laid Plans" features the revelation of a grave mistake made by the couple in their yesteryears. The choices made in the past has some serious impact on the future of their child.

According to ABC's synopsis for "Once Upon a Time (OUAT) Season 4 Episode 17, Hook informs Emma about impending danger. He warns Emma that her future is in danger that maybe connected to Charming and Snow White's past decisions.

"Best Laid Plans" will feature a flashback scene revealing Snow White and Charming's desperate measures to ensure the good future of their child. In the past, a travelling peddler suggested the couple to meet the old hermit in order to secure the future of their unborn child. However, a promising future of their child comes with a price that continues to worry them for years to come.

Meanwhile, the Evil Queen Regina takes the villains on a bootless errand. Elsewhere, Henry makes an important discovery in his quest to find the author of the book. As for Mary, Margaret and David they decide to reconsider their plan of action.

 A promo video for Episode 17 "Best Laid Plans" teases a revelation of a terrible mistake made in the past. "How far would you go to protect your loved ones? A revelation that will destroy a family," voiceover says in the video published on YouTube.com by Promos and Previews. Scroll down to watch the trailer. Fans can also take a glimpse at the events of the upcoming episode via photos published on TV Fanatic.

"Once Upon a Time" Season 4 Episode 17 (Best Laid Plans) airs Sunday, March 29, 2015 at 8:00 pm on ABC. Stay tuned for more spoilers.