"Once Upon a Time" season 5 episode 14 will see the god of the underworld and the evilest dark one that ever lived attempt to come to an agreement, which, considering the level of trickery these two know, could likely end up being nothing but a lopsided bargain.

The promo for the upcoming episode of "Once Upon a Time" season 5 titled "Devil's Due" describes Hades and Gold's tandem "a match made in heaven." In the episode, the former meets up with the latter to negotiate "a deal."

However, it does not look like this deal will help any of the heroes save Hook. If anything, it will only endanger them. More troublingly, it looks like whatever Hades is prepared to give Rumple will be enough for him to work with the underworld boss.

According to the synopsis for "Once Upon a Time" season 5 episode 14, Gold will suddenly take interest in helping Emma and the others in rescuing Hook in order for Rumple himself to finally head home and reunite with Belle.

However, in order to be fully of help to the group, he must seek help from his former wife Milah (played by Rachel Shelley), who will become the latest person from the past that fans will once again get to see in "Once Upon A Time" season 5.

Apart from their meeting in the present, the episode will also feature flashbacks in Fairy Tale Land showing the former couple tackle a life-or-death crisis for the sake of their son Baelfire. 

From the looks of it, Milah will finally get her long-awaited closure with both Rumple and Captain Hook in this "Once Upon A Time" season 5 episode. Fans will remember that she left Rumple for the pirate.

Meanwhile, Hook's hostility is making Hades angrier in "Once Upon a Time" season 5. Hades offered the heavily battered pirate his freedom in exchange for three of his friends being left behind in his fiery realm.

As fans would imagine, Hook is noble enough to not even consider this deal and risks being drowned to the River of Lost Souls. Just as he was about to be reduced into a "mindless" spirit in the menacing river, Emma bolts into Hades's den vowing to save the love of her life.

"Once Upon a Time" season 5 episode 14 "Devil's Due" airs March 20 at 8 p.m. ET on ABC.