Elysia Rotaru

In the season four finale, Oliver teams up with a surprising force in an attempt to stop Damien Darhk and his magic once and for all.

Team Green Arrow's ongoing battle with Damien Darhk is complicated by a shocking revelation. Meanwhile, Thea's bloodlust returns and she loses control in front of Alex (guest star Parker Young).

Oliver receives an offer from Nyssa that is hard to refuse. Meanwhile, Thea continues to battle her bloodlust, and Malcolm steps in to help his daughter. Laurel has a heart-to-heart talk with Nyssa.

Oliver and the team uncover HIVE's plan to take out Team Arrow once and for all. With HIVE's next attack imminent, Lance wonders if Donna is safer without him in her life. Meanwhile, with the wedding fast approaching, Oliver begins to feel guilty that he hasn't told Felicity about his son.

Oliver and Diggle learn that Merlyn is going to break Darhk out of prison. Meanwhile, Laurel gets a surprising offer.

When Team Arrow learns what Damien Darhk's devastating next move is, Felicity realizes she needs to ask her father, Noah Kuttler (Tom Amandes), for help. Noah and Oliver have a heart to heart talk that leaves Oliver rattled.