After Arrow and The Flash helped launch the new CW series DC's Legends of Tomorrow during the first half of each show's seasons, both series will refocus their storylines on their respective central villains once Legends premieres on January 21st.

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For Arrow, that means the series is going to double down on Oliver Queen's (Stephen Amell) quest to take down Damien Darhk (Neal McDonough). Showrunner Marc Guggenheim said fans can expect to be surprised by a twist coming up with the season's Big Bad."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 told IGN while promoting Legends of Tomorrow at the Television Critics Association winter press tour. "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."He wouldn't elaborate much, but he did clarify that this big twist "doesn't involve a character death. It's a move that we've never made with one of our Big Bads."Guggenheim said his goal is to "always try to do something differently." In Season 4, the intent was to mix up the familiar structure of 23 episodes with a "Big Bad climax at the end.""One of the things I felt personally very strongly coming into Season 4 was Season 3 -- and I love Season 3. I know Season 3 gets knocked, but there's a lot of episodes there that I don't think quite get their due -- it ended with this orgy of plot twists, which I love," he said. "We went into Season 4 going we want Season 4 to resonate for reasons other than the plot twists. We want to come in and be very disciplined and tell a different kind of story. Even looking ahead to Season 5, to tempt fate, how's that going to be different?"On The Flash side, showrunner Andrew Kreisberg promised a similar focus on Season 2's Big Bad, Zoom."The rest of the season is really focusing on Zoom and the Multiverse ," he told reporters at TCA. "The early parts of seasons are really hard because you're setting things up. For us, that was sort of what the fun of Legends was was getting to bring all these characters on and having them fill out these early episodes while still being tied into the main narrative. But now for Arrow and for Flash, on Arrow it's Oliver versus Darhk and on Flash it's Barry versus Zoom, and that's really where the focus for both of those shows lie."Don't expect many Arrow and The Flash crossovers with Legends of Tomorrow once the series launches, but Kreisberg did tease how the shows will remain connected. "It's less about Flash and Arrow touching on Legends, and more about how Legends fits in with the Arrowverse history that we've created," he said. "Legends is going to touch on both of those shows in some fun ways."The Flash returns Tuesday, January 19th at 8 p.m. ET/PT, Arrow returns Wednesday, January 20th at 8 p.m. and Legends of Tomorrow premieres Thursday, January 21st at 8 p.m. on The CW.

Terri Schwartz is Entertainment Editor at IGN. Follow her on Twitter at @Terri_Schwartz