Once Upon a Time Photos from "The Broken Kingdom"

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After Lancelot gives Mary Margaret his warning, she views King Arthur in a whole new light in Once Upon a Time Season 5 Episode 4

But when David has his doubts about Lancelot, will Mary Margaret have to take matters into her own hands to save those she loves?

Even Queen Guinevere begins to worry that her husband has become obsessed with making Excalibur whole again and decides to take Lancelot and head into the heart of darkness to find some answers.

Make sure to tune in Sunday night to see "The Broken Kingdom" and if you can't wait to see the magic you can watch Once Upon a Time online here at TV Fanatic. 

1. Fighting a New Threat - Once Upon a Time

When Mary Margaret realizes that Arthur may be the real threat, she has to take matters into her own hands on Once Upon a Time. "The Broken Kingdom" is the fourth episode of the show's fifth season.

2. Is Arthur Losing His Way - Once Upon a Time Season 5 Episode 4

Guinevere senses that Arthur is losing his way in his quest to make Excalibur whole again on Once Upon a Time.

3. Arthur and Guinevere - Once Upon a Time Season 5 Episode 4

Despite her doubts, will Guinevere stick by her king or try to figure out the truth on her own.

4. The Heart of Darkness - Once Upon a Time Season 5 Episode 4

Guinevere sets off with Lancelot on her own quest into the heart of darkness on "The Broken Kingdom"

5. The Voice In Her Head - Once Upon a Time Season 5 Episode 4

Is Rumplestiltskin still the evil voice inside of Emma's head and if so, will she be able to fight it?

6. Lancelot - Once Upon a Time Season 5 Episode 4

What does Lancelot know about King Arthur? What more has he told Mary Margaret that makes her believe he could be a threat?

7. Working Together - Once Upon a Time Season 5 Episode 4

Will David and Mary Margaret be working together to combat the latest threat to those they love? At least they've both got their swords at the ready.

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Once Upon a Time Season 5 Episode 4: "The Broken Kingdom"
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Once Upon a Time Season 5 Episode 4 Quotes

Be careful. Love is a weapon, Deary. The most dangerous weapon of all which means the pain you should worry about isn't the kind inflicted by a broken sword but the kind that comes from a broken heart.

Rumplestiltskin

Hook: You can hide buried treasure or a winning poker hand but you cannot hide the bloom of first love.
Emma: Yes, he has a crush and he straight up lied to my face and I'm the Dark One.
Hook: You're his mother.
Emma: Which is scarier.
Hook: To him? That's up for debate.