Green Arrow and John Constantine are reunited in an image posted by Arrow star David Ramsey. 1 / 7
Matt Ryan has played Constantine since the ill-fated 2014 NBC series. 2 / 7
He guest starred in Arrow season 4 and eventually became a series regular on DC's Legends of Tomorrow. 3 / 7
The image shows Ramsey's John Diggle along with Katherine McNamara's Mia Smoak, Stephen Amell's Oliver Queen and Ryan's Constantine. 4 / 7
Though the photo appears to be taken in the woods of Lian Yu, there is no way to know for certain. 5 / 7
It's also unclear when this crossover will take place. 6 / 7
It could be in Crisis on Infinite Earths or it might be some other point during Arrow season 8. 7 / 7