Arrow: Comic Book-Style Promo For Epi 420 (May 4)

"Genesis": "As Oliver and Felicity look for a magical solution to defeat Darhk (guest star Neal McDonough), a vengeance-driven Diggle gets a lead on Andy’s (guest star Eugene Byrd) whereabouts and heads off to confront his brother. Meanwhile, Alex (guest star Parker Young) takes Thea on a vacation that quickly turns into a nightmare.” - The CW