Hook/Killian Jones (Colin O'Donoghue) trading his hook for a hand on ABC's Once Upon a Time will not be without its negatives - in fact, he may come to regret it.

Snow Queen "Has Her Sights" On Emma As Elsa & Snow Find "Solace"

Hook enlists Rumplestiltskin (Robert Carlyle) to swap his hook for a hand ahead of his first date with Emma (Jennifer Morrison). However, it will come at a price.

As it turns out, swapping the hook "was a really, really stupid thing for [Hook] to do," Carlyle told TVLine in a new report. "That comes back to bite him, really badly."

Jennifer Morrison Explains How Emma & Hook Are Both "Pirates" In Their Own Ways

The big first date takes place in Sunday night's episode, titled The Apprentice, and Morrison said that Emma and Hook will have a good time on the date.

"We actually have a great date," Morrison said. "There are a lot of fun elements to it, because we're seeing both of them so vulnerable with each other. Emma's genuinely excited about getting to know this person, hopefully outside of crisis."

Morrison also explained to TVLine and other reporters that Emma is wearing clothing that is "very soft and feminine and romantic," a stark contrast compared to her usual wardrobe.

"That's something that I think has always been a part of her, but she's always had to have her guard up so much that she hasn't felt like she could express that side of herself," Morrison added, discussing Emma's feminine side.

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