"Once Upon a Time," "Labor of Love"
IN PHOTO: Emma (Jennifer Morrison), Hercules (Jonathan Whitesell), Mary Margaret (Ginnifer Goodwin) and Regina (Lana Parrilla) prepare to take on Cerberus. ABC

Tonight is an all-new episode of "Once Upon a Time" on ABC and things are heating up in the underworld. With our heroes running into more danger, they will need to seek help from an outside source.

From the episode synopsis and preview trailer we will finally see Hercules (Jonathan Whitesell) introduced to the series. ABC has also released a few sneak peek videos, which give us some insight into where Hook (Colin O'Donoghue) is being held and why Hercules is in the underworld. In the first clip we see Mary Margaret (Ginnifer Goodwin) and David (Josh Dallas) discussing helping Hercules settle his unfinished business so he can move on, while in the second teaser we see Hook attempting to help another prisoner escape.

The synopsis for episode 13, "Labor of Love," reads: "In the Underworld, an escapee from Hades' prison informs the heroes that Hook is being held captive. But before the heroes can rescue Hook, they must face a terrifying beast that guards the prison. Mary Margaret searches for an old childhood friend who knows how to defeat the monster. However, once reunited, she discovers that her friend is no longer the hero he once was. Meanwhile, in an Enchanted Forest flashback, a young Snow White struggles to preserve peace in her kingdom and must learn how to be a true hero if she wants to one day become queen."

"Once Upon a Time," "Labor of Love" will air Sunday, March 13 starting at 8:00 p.m. EDT on ABC and will be available the next day on abc.com, iTunes, Hulu, Amazon and more. ABC does offer a live stream service on its website so if you do not own a TV you can view your favorite programs on your computer, tablet or smartphone.

If all else fails you can watch the episode live here, here and here.

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