Arrow has saved Constantine.
While the series may not be returning, it's confirmed that Matt Ryan will be reprising as Constantine in an upcoming episode of Arrow.
Matt Ryan took to his Twitter account to post the following video that the rumors are true.
Likewise, Stephen Amell took to Twitter to respond with: "Hey, Matty... Welcome to Arrow!"
When NBC recently cancelled Constantine, Stephen Amell came out supporting the series stating he would even guest star on the show if it ended up getting picked up at another network. While that didn't happen, at least Constantine will live on for one more episode this season on Arrow.
Update: EP Marc Guggenheim offered the following details (via TVInsider.com):
"We are super-crazy excited about this," Guggenheim said of the "one-time-only deal," which is currently scheduled for the fifth episode of Arrow's upcoming season. "Each year on the show, we have added and expanded the mythology with different elements. In Season 2 we introduced the idea of superpowers, last year brought in the League of Assassins, and for Season 4, we always had a plan to introduce magic and mysticism. We were already swimming in those waters and that's why Constantine is this great organic little development."
Guggenheim teases Constantine is brought into the series as a result of Sara Lance's resurrection through use of the Lazarus Pit.
"Unlike Thea, who wasn’t fully dead, the consequences of using the pit on someone as dead as Sara was creates some unforeseen difficulties...and John Constantine is uniquely suited to help our team deal with those," Guggenheim offered.
Guggenheim also says Matt Ryan will look like his usual hell blazing self, and that an original director is on board Arrow to helm the episode.
"The trench coat, the tie, the shirt...the whole wardrobe is being taken out for storage and shipped up to Vancouver." Guggenheim said, adding tht John Badham, a director on Constantine, is also on board to direct the episode. "He is familiar with Constantine and Matt Ryan, so it’s a wonderful combination."
Check out the video announcement by Matt Ryan and the tweet by Stephen Amell: