'Once Upon A Time' season 5 finale spoilers, plot news: Regina mourns, Gold endangers all of Storybrooke

"Once Upon A Time" season 5 will conclude in a grand two-hour finale, which will be packed with action and drama. There will be two separate episodes that will be aired back-to-back.

Hades (Greg Germann) has been exterminated by the heroes, but unfortunately, Robin (Sean Maguire) had to die before the lord of the underworld was ultimately defeated.

In the first half of the "Once Upon A Time" season 5 finale titled "An Untold Story," the victory won't feel much like one for Regina (Lana Parilla), who is still struggling to move on from the love of her life's untimely death.

The actress revealed in an ABC interview that her character is going to "need some time" to recover. "I think she's quite overwhelmed by all of this, but that was like a test of true love, really. I think she's devastated and we're going to see how she handles that loss in the finale," Parilla added.

However, Regina will be forced to set aside her feelings after a new threat arises. Gold (Robert Carlyle) is in possession of the Olympian Crystal and plans to bind all of Storybrooke magic to it.

In order to stop all of this and bring his family to safety, Henry (Jared S. Gilmore) "goes rogue" and heads to New York in the "Once Upon A Time" season 5 finale to destroy magic as they know it.

The action will continue in the second hour of the "Once Upon A Time" season 5 finale titled "Only You," where Regina and Emma (Jennifer Morrison) will go looking for Henry before Gold finds him.

Although Regina joins the fight, her head is not entirely in the game since the Evil Queen inside her was awakened after the tragedy of Robin's death. This had many thinking that Regina's sinister alter ago will take over her again.

Meanwhile, as all this happens in "Once Upon A Time" season 5 finale, Snow (Ginnifer Goodwin), David (Josh Dallas), Hook (Colin O'Donoghue) and Zelena (Rebecca Mader) help each other to bring Merida (Amy Manson) and the others to their homes, only to be sucked up in a "deranged new world" instead.

There, they are imprisoned and are met by not-so-friendly individuals who can "give Gold a run for this money." The "two very disturbed individuals" could be of help to the heroes but they must fight them first. So, in a way, they have something good going here despite the setback.

"Once Upon A Time" season 5 finale "An Untold Story" and "Only You" will air on May 15 at 7 p.m. EDT on ABC.