Someone's life is set to end in ABC's "Once Upon a Time" season 5. Also, Sam Witwer is set to recur as an ominous warden at a mental institution.

According to iDigital Times, Gold and Milah were featured in a flashback in "Once Upon a Time" season 5. As per the publication, the FairyTale Land flashbacks saw Rumple and Milah in a life versus death conflict, which also involved their son, Baelfire. The situation reportedly left Rumple with no choice but to engage with an agreement that would haunt him.

In the previous episode, Gold was suddenly enthusiastic to lend a hand to Emma, David, Robin, Heny, Snow, and Regin look for Hook so he could go back home to Belle. However, he must search for his ex-partner Milah in the Underworld and ask for her help. As per the publication, the series' promo featured Emma looking for Hook, after Hades sent him to the underworld. Emma was seen chasing Hook, but it is yet to be revealed if she could save the Peter Pan villain.

"Once Upon a Time" season 5 episode 14 is entitled "Devil's Due." According to Spoilers Guide, the episode is set to see Gold look for details to help Emma rescue Hook from Hades' hands. Also, the Greek god starts to unleash his madness to the heroes.

As per the publication, things get worse for the captured Hook when Hades threatens to condemn him to the River of the Lost Souls after the former denied to select who among his three friends will have to stay in the underworld.

"Being Human" actor Sam Witwer is also set to reprise his role as the evil mental institution warden, along with "Popular" alum Hank Harris, who is set to reprise his role as Nathaniel, a patient whom the former always torments, as per TV Line.

Aside from Jeremy Carver and Anna Fricke's drama fantasy horror series "Being Human," Witwer is also known for his roles in Frank Darabont's sci-fi thriller "The Mist," Mark Neveldine and Brian Taylor's action crime thriller "Crank," and Simon Kinberg's action adventure "Star Wars Rebels." He is set to play the role of Burnham in Shawn Crahan's action film "Officer Downe," which is slated to hit theaters this year.

"Once Upon a Time" season 5 episode 14 is set to air on Mar. 20.