Wes Brown has been cast as Gaston in "Once Upon A Time" Season 5 and Robbie Kay reprises his character as Peter Pan. ABC also released the official plot synopsis for "Unfinished Buisness" which marks the 100th episode of the show.

"True Blood" alum Wes Brown has been officially cast for "Once Upon A Time" Season 5. According to iDigital Times, Brown will be playing the character of Gaston, Belle's (Emilie de Ravin) dangerous suitor. His storyline will take back to the time before Belle met Rumple (Robert Carlyle). Brown's character is set to debut anytime soon when the 2nd half of the season returns.

Additionally, Robbie Kay returns on set after 2 years to reprise his role as Peter Pan. The 20-year-old English actor dished that fans will see a different Peter this fifth season that there is even a possibility that he will be the newest villain. Kay's character is set to debut in the show's 100th episode milestone as reported by Spin-off Comic Book Resources.

As for the official synopsis of episode 13, TV Line notes, "Rumple et al encounter foes and family. Peter Pan included in the Underworld; Emma comes to terms that her role as Savior is just beginning; The Charmings realize there are consequences to their jump to the Underworld, leaving a child behind.

Regina and her mom have a reunion, given Cora's dying words; Hades harbor an important, non-familial tie to someone Belle becomes very involved in the main arc; Ruby and Mulan resurface."

"Once Upon A Time" Season 5 episode 13 (aka the show's 100th episode) is entitled as "Unfinished Business". The forthcoming episode is slated to premiere on Sunday, March 6, 2016 at 8:00 p.m. exclusively on ABC.

"Once Upon A Time" is an American fairy tale dramatic series created by Edward Kitsis and Adam Horowitz. The storyline takes place in the fictional seaside town of Storybrooke, Maine.