Tags: Once Upon A Time Season 5 Spoilers

'Once Upon a Time' season 5 returns in March. Heroes will arrive in Underworld to rescue Hook.

"Once Upon a Time" Season 5 will once again go back in time, this time to focus on the backstory of half-sisters Regina and Zelena. Two young actresses have been cast to play them.

Wes Brown has been cast to play as Gaston in 'Once Upon A Time' Season 5. On the other hand, Robbie Kay returns to reprise role as Peter Pan. Plus, ABC releases plot for the show's 100th episode.