Once Upon a Time reveals season 5B's fiery villain 

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, the residents of Storybrooke have been plagued by wicked witches, icy queens, and even a murderous Peter Pan — But Emma (Jennifer Morrison) & Co. will face their toughest opponent yet when they arrive in the Underworld.

EW can exclusively reveal what many have speculated:

alum Greg Germann will indeed be playing Hades, the devilish dictator of the Underworld.

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version of Hades in the second half of the season,” executive producer Adam Horowitz tells EW. “While he is both inspired by a myth and by the Disney movie version, as we like to do, we’re trying to create our own

spin. We can’t wait for everyone to see what [Germann] does with the character.”

Germann is slated to make his debut “right away” in the midseason premiere, which also marks the ABC fairy tale drama’s landmark 100th episode, in which Emma, her friends and family try to rescue Hook (Colin O’Donoghue) from the Underworld. “He absolutely has a surprising connection to one of our cast,” executive producer Edward Kitsis says, though Horowitz is quick to add: “Before everyone runs to Twitter to give their opinions on it, he’s not related to anyone, but there is a connection.”

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