OLIVER TEAMS UP WITH A SURPRISING FORCE TO STOP DAMIEN DARHK – Oliver (Stephen Amell) teams up with a surprising force in an attempt to stop Damien Darhk (guest star Neal McDonough) and his magic once and for all. John Behring directed the episode with story by Greg Berlanti and teleplay by Wendy Mericle and Marc Guggenheim (#423). Original airdate 5/25/2016.
Who is this "surprising force"?
I WISH it would have been the return of Slade, but that would be too good to be true.