Oliver Queen: Who was Fyers talking to?
Slade Wilson: I don't know. Sounds like someone off this island, maybe his benefactor. More importantly, who or what is Scylla?
Oliver Queen: The Scylla and Charybdis. It's "The Odyssey" from one of the four nightmare chapters. Scylla was a monster.
Slade Wilson: I want to meet this monster.
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From: Arrow