"Labor of Love" is the thirteenth episode of the fifth season of the American fantasy drama series Once Upon a Time, which aired on March 13, 2016.

Deep inside Hades' lair, an injured Hook awakens and notices a young woman who is also trapped with him in the chamber.

When she sees the tombstone of Hercules, David is surprised to learn that she knew the Demi-God, and believes that he has unfinished business with her, which gives them the idea to help him while seeking out Hook.

Later on at Granny's Diner, Emma and Regina are joined by Mary Margaret, and thanks to the Blind Witch, they find Hercules, who they hope he will complete his Twelve Labors before he can move on, being Cerberus.

Instead of finding the map, Henry sees Cruella, who explains to him that because he is now the Author, he can bring her back to life, and despite the fact that he broke the Quill, it’s still alive in the Underworld as it has unfinished business to write people's stories.

As they reached the tunnel with Cerberus waiting for them, Hercules starts to lose his courage in front of Emma, Mary Margaret and Regina.

When Cerberus enters the apartment, everyone splits up, leaving Hercules, Mary Margaret, and the woman trapped inside the library.

Hercules receives medals for his Twelve Labors, and he is seen with eleven, meaning he has completed all of them except for killing Cerbeus (the unfinished business keeping him in the Underworld).

In a review from Rickey.org, Nick Roman said, "This just might have been the best Once Upon a Time so far this season, despite “Labor of Love” largely focusing on two people we’ve only just met.

This episode had the perfect balance of well-paced drama, strong character arcs, and a solid twist or two to compel us to come back next week.

"[1] Andrea Towers of Entertainment Weekly notes in her assessment of the review: "Once isn’t exactly a novice when it comes to turning fairytales on their heads, and rarely do they follow stories to the letter.