In a recent interview with IGN, Arrow's showrunner, Marc Guggenheim, dished about what lies ahead in season 4 of the CW show.

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The publication caught up with Guggenheim while he was promoting Legends of Tomorrow at the Television Critics Association. The executive producer of Arrow revealed that while there will be plenty predictable stuff lined up for fans a big shocker awaits them in episode 15.

"The back half of the season, we're pretty much following the same structure that we have in seasons past where obviously the Big Bad gears up. That said, we're going to throw a hard six in episode 15 that I think will surprise people," he said. "We're going to do something that's never been done before on Arrow with the Big Bad. 15 is a real game-changer episode for us."

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And for those of you who are thinking this is linked to the major death on the show, the mystery of the person in the grave, you are mistaken. Guggenheim clarified that this "doesn't involve a character death. It's a move that we've never made with one of our Big Bads."

Here's the official synopsis for the midseason premiere, titled 'Blood Debts':

"THE AFTERMATH - Oliver (Stephen Amell) must deal with the devastating consequences of Darhk's (guest star Neal McDonough) last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Dahrk. Jesse Warn directed the episode written by Oscar Balderrama & Sarah Tarkoff."

"Blood Debts" will air on January 20 on The CW.

Watch the teaser:

Tags: Arrow the cw television