MARY MARARET ENLISTS THE HELP FROM A CHILDHOOD HERO TO SAVE HOOK'S LIFE, ON ABC'S "ONCE UPON A TIME"

Greg Germann Guest Stars as Hades, Jonathan Whitesell as Hercules, Kacey Rohl as Megara, and Bailee Madison as Young Snow White

"Labor of Love" - 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 on "Once Upon a Time," SUNDAY, MARCH 13 (8:00-9:00 p.m. EDT) on the ABC Television Network.

"Once Upon a Time" stars Ginnifer Goodwin as Snow White/Mary Margaret, Jennifer Morrison as Emma Swan, Lana Parrilla as the Evil Queen/Regina, Josh Dallas as Prince Charming/David, Emilie de Ravin as Belle, Colin O'Donoghue as Hook, Jared S. Gilmore as Henry Mills, Sean Maguire as Robin Hood, Rebecca Mader as the Wicked Witch/Zelena and Robert Carlyle as Rumplestiltskin/Mr. Gold.

Guest stars include Emma Caulfield as the Blind Witch, Victoria Smufit as Cruella De Vil, Kacey Rohl as Megara, Jonathan Whitesell as Hercules, Bailee Madison as Young Snow White, Kerry van der Griend as Peasant, Teach Grant as Dead Eye the Bandit, Janet Walmsley as Woman Peasant and Greg Germann as Hades.