While Emma (Jennifer Morrison) and Hook (Colin O'Donoghue) aren't always on good terms on ABC's Once Upon a Time, he will remain devoted to her in the weeks to come.

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Emma is set to go through a major storyline involving her heart and how it is capable of the most darkness. While some characters may try to use that to their advantage, Hook will do his best to protect her.

"Hook feels that his job is protecting Emma's heart at all costs, so we will see that play out," OUAT co-creator Edward Kitsis told TVGuide.com this week.

The Queens of Darkness, a.k.a. Maleficent (Kristin Bauer van Straten), Cruella de Vil (Victoria Smurfit) and Ursula (Merrin Dungey), will inevitably try to exploit this information, as Kitsis added.

"It's not so much recruitment as exploiting that potential for darkness," he said. "We're going to see all of them try to see how they can use it for their own ends."

Asked what would happen to Emma's wardrobe if she were to turn to the dark side, Kitsis noted that her trademark jacket would likely still stay, as long as Emma had her way.

"You would have to pry that jacket from her." Kitsis said. "If Emma were to turn to the dark side, if there's one thing you can say about our show, it's that our costume department always rises to the challenge."

If she did turn to darkness, it could provide interesting drama with her son Henry (Jared Gilmore), who has the heart of the truest believer.

"Henry would do his best his best to keep her on the good side of the Force," Kitsis said. "Henry has the heart of the truest believer, and the truest believer always believes in you even when you're maybe going down a wrong path."

Once Upon a Time airs Sundays at 8 p.m. ET/PT on ABC.

Watch the promo for the next episode of Once Upon a Time here:

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Once Upon A Time, Television, ABC