Arrow Season 5, Episode 16 : Checkmate

Oliver gets closer to the truth about Prometheus. Meanwhile, Helix refuses to continue helping Felicity until she does a favor for them. Guest Stars: Rick Gonzalez, Juliana Harkavy, Parveen Dosanjh, David Meunier, Mike Dopud, Adrian Holmes, Kaare Anderson, Nilo Ghajar, Carly Pope, Kacey Rohl, Celia Reid, Lexa Doig, David Nykl,

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