20. Genesis

Complete story — includes the ending

Darhk returns to H.I.V.E. and kills two of the board members before renewing his plans for "Genesis". Oliver and Felicity go to Hub City and meet an immortal shaman, Esrin Fortuna, who starts educating Oliver about dark magic. After a mystical ritual, Fortuna tells Oliver that the darkness inside him is too strong to channel the light. In Star City, John locates Andy, but is captured after a brief shootout. Andy places a tracking device on him, then allows John to escape so that Darhk and his team can go after John and Lyla and steal "Rubicon", the key to the world's nuclear weapons. Oliver manages to stop Darhk by channeling the power of light, nullifying Darhk's powers and forcing him to retreat. John kills Andy. Meanwhile, Thea and Alex, who is working for Ruvé now, go to an unknown city for vacation. She soon realizes that the city is atypical and finds out that Alex is using Darhk's mind control pills. She is subdued by Darhk's operatives and the city is revealed to be under Star City. The team realizes that Darhk plans to detonate nuclear weapons and build a new world over the ashes.