Stephen Amell took to social media yesterday to say that of all of the returning cast members that will appear in next week’s season 5 ‘Arrow‘ finale, he is most excited about the one that we the fans do not know about yet. Who could this be? The return of Roy Harper or Tommy Merlyn? We will find out next week when Arrow wraps up its 5th season with the episode, ‘Lian Yu‘. In the meantime, let us know who you think it is AFTER THE JUMP.