It appears as though the upcoming Arrow episode which stars Matt Ryan as John Constantine will have ramifications for the long term in the CW's corner of the DC Universe.
In a new interview with TV Insider, showrunner Marc Guggenheim opened up about just what the Hellblazer will be doing when he appears on Arrow...and it has to do with the return of Sara Lance, seen being resurrected from the dead via Lazarus Pit in the trailer for DC's Legends of Tomorrow, which will spin out of Arrow and The Flash in early 2016.
According to the site, Constantine's arrival will "factor into the fallout" Sara's resurrection.
"Unlike Thea, who wasn't fully dead, the consequences of using the pit on someone as dead as Sara was creates some unforeseen difficulties," said Guggenheim. "And John Constantine is uniquely suited to help our team deal with those."
Arrow returns on October 7 with new episodes airing Wednesdays at 8 p.m. ET/PT on The CW.