We already have Hercules, Hades and Megara to come, so who else may join them? Will the second half of this season of ABC's Once Upon a Time introduce the whole world of Hercules? 'Once Upon a Time' Showrunners Talk 'Regina the Savior' Story Arc Once Upon a Time fans already know that they will be meeting Hercules, Megara and Hades, played by Jonathan Whitesell, Kacey Rohl and Greg Germann, respectively.

Emma is ready to fight for true love, no matter the cost. Emma (Jennifer Morrison) will lead the journey into the underworld when ABC's Once Upon a Time returns next spring, but it certainly won't be an easy one.

'Once Upon a Time's resident "evil queen" is about to get a boost in screentime.

The 'Once Upon a Time' showrunners tease what's ahead for Rumple and Belle. With Rumplestiltskin (Robert Carlyle) now possessing all the Dark Ones' powers, how will this complicate his relationship with Belle (Emilie de Ravin) on ABC's Once Upon a Time? What Will 'Once Upon a Time's 100th Episode 'Honor' To Please Longtime Fans? Rumple is back to being the ultimate Dark One, as Once Upon a Time fans saw in Sunday night's midseason finale.