New hope for stopping Slade’s army emerges in the form of new allies and a viable cure for the Mirakuru, leading Oliver to a final showdown. Meanwhile Laurel is kidnapped, and Diggle and Lyla infiltrate A.R.G.U.S. after they target the city for destruction.

U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.

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From The CW:

OLIVER MUST DECIDE ONCE AND FOR ALL IF HE'S A KILLER OR A HERO - Slade (Manu Bennett) moves forward with his plan to kill one more person in Oliver's (Stephen Amell) life. While Oliver has fought all year to be more than the killer he once was, when Slade kidnaps someone close to Oliver's heart, Oliver is pushed to the edge and realizes sometimes it takes doing the unthinkable to stop the monster. Meanwhile, Diggle (David Ramsey) takes on Amanda Waller (guest star Cynthia Addai-Robinson) with a little help from some friends, and Thea (Willa Holland) turns to Roy (Colton Haynes) in her time of need.