Arrow crafted enough upheaval with its Season 3 finale “My Name is Oliver Queen” to leave Season 4 something of a blank slate, but it seems the League of Assassins will remain in play. Not only has John Barrowman confirmed that Malcolm Merlyn will return this fall, but so too will the “Canary sisters” have a part to play in setting up certain Legends.

Speaking at Las Vegas Comic-Con, Season 3 regular Barrowman confirmed that Malcolm Merlyn would indeed be present for Season 4, though in what capacity remains to be seen, given — SPOILER ALERT — the character’s ascension as the new Ra’s al Ghul. Barrowman also teased that fans of Sara and Laurel Lance’s superhero alter-egos will enjoy the new season:

We start filming [Season 4] in July, I just finalized my deal about a week ago … it was just about working out dates and stuff. I’m very excited about going back. I can’t tell you anything, because I do know a bit of what’s gonna happen, but if you love Malcolm Merlyn, if you love Oliver Queen, if you love Thea Queen, if you love the Canary sisters [cheering] … I say that with a bit of a twist and a joke, you’re gonna love what’s gonna happen across the DC world.

Barrowman undoubtedly refers to the confirmed Lazarus Pit resurrection of Sara Lance, as seen in the Legends of Tomorrow trailer as the avenue through which the “White Canary” arises. Given that Legends won’t premiere until early 2016, it remains to be seen if Sara’s resurrection takes place early on, or under what circumstances her body would have been exhumed.

Also worth noting as a potential source of Malcolm Merlyn’s presence, Stephen Amell recently teased that the Arrow Season 4 premiere might bring about some complications for Oliver’s sister Thea (Willa Holland), describing 401 with the cryptic tease “What’s wrong, Speedy?” Thea had herself undergone a Lazarus Pit resurrection toward the end of Season 3, something Malcolm ominously warned could bring about a dramatic change in Thea’s character, the implications of which were only vaguely glimpsed in intervening Season 3 hours.

Thus far of Arrow Season 4, we know the fourth year is expected to somewhat creatively revamp the series after its Season 3 finale saw Oliver retiring the vigilante lifestyle, at least with his current costume. In addition to a focus on DC villains H.I.V.E. and Damien Darhk, Season 4 may also feature flashbacks amid Green Lantern’s hometown of Coast City, while creatively current Co-EP Wendy Mericle has been elevated to co-showrunner alongside Marc Guggenheim, and Punisher: War Zone director Lexi Alexander will helm an episode.

Arrow Season 4 will debut plenty of new details (and potentially some footage) from DC’s Superhero Saturday panel at Comic-Con 2015, but could Malcolm Merlyn’s return bring about Sara’s resurrection early on? How else might Arrow Season 4 or The Flash season 2 set up DC’s Legends of Tomorrow before 2016?

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