Viewers will finally get to watch what happens when the good and evil characters join forces to save Hook from the Underworld on Mar. 6. Actor Josh Dallas revealed people from the characters' past will be encountered in the underworld.

"We're going to meet some people down there that maybe you don't expect or you haven't seen I quite a while," Dallas said in an interview with Entertainment Weekly. He added, "There is definitely a particular person down there for David that he's going to come across, and Mary Margaret will ocme across that person too."

In another interview, where executive producers Edward Kitsis and Adam Horowitz got to tweet their answers, Horowitz said "It would stand to reason that some of her victims might be in the Underworld," when asked about Regina's murder victims.

Another storyline to look forward to when the series resumes would be the back story of tweenage Regina and Zelena. Child actress Ava Acres will play the young Regina and actress Isabella Blake as the young Zelena. Co-creator Eddy Kitsis said that Zelena's adventure in Oz and with Dorothy will have a connection with the Underworld plot in the series.

Another relationship that would come to focus on the second half of the season would be that of Belle and Rumple. A villain from "Beauty and the Beast" will also make a comeback. Gaston's association with Belle in the past will also be tackled in the remaining episodes. However, the publication added that a different actor would be playing the role of Gaston. Actor Sage Brocklebank who was casted in season 1 will be replaced by another actor, Wes Brown.

"Once Upon A Time" season 5 will return on March 6 after three months hiatus.