In the next episode of Once Upon A Time, Snow White and Prince Charming leave the world of domestic bliss and begin fighting over Charming's new best friend, King Arthur.

In a sneak peek of a scene from the upcoming Oct. 18 episode, titled "The Broken Kingdom," Emma becomes ill, resulting in her parents having a major disagreement on their next course of action to rescue their daughter from the darkness that theatens to overtake her as she becomes the Dark One.

In a previous sneak peek of "The Broken Kingdom," Emma heeds the call of the dagger that has her name inscribed on it and has a discussion with her inner Rumpelstiltskin. This new scene takes place in the same location—Regina's room in the castle—meaning that Emma did not recover the dagger, but her illness suggests that her struggle against the darkness inside her has become much worse.

Last week's episode saw a bromance form between Prince Charming and King Arthur as the two set out on a quest. However, viewers soon learned that Arthur isn't all that he claims, especially after Lancelot, thought dead, appears to Snow and tells her that she cannot trust the king of Camelot.

Here in this clip, the married couple argues over Arthur's trustworthiness and it seems that Charming isn't quite yet ready to let go of his new friendship with King Arthur.

So who will win the argument? At some point, it's likely that Charming will learn more of the truth about Arthur.

"It's a tricky one because you can tell that Arthur and Charming would be best friends in another world," said Once Upon A Time co-executive producer Eddy Kitsis at New York Comic Con, as reported by TVLine. "But Arthur is doing what he thinks is best for his kingdom, and Charming has to do what's best for his family, and that's going to put them at odds."

Horowitz also stated that the series will unveil the background behind the relationship between Arthur, Lancelot and Guinevere. In the traditional tales of King Arthur, Lancelot and Guinevere fall in love, which is given as a reason in Once Upon A Time for Lancelot's absence at Camelot. But it seems there is much more to the story.

"We're going to learn a lot more about Lancelot's past and the iconic love triangle involving him, Arthur and Guinevere," said Horowitz.

Once Upon A Time airs Sundays on ABC.

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