Arrow Season 4, Episode 13 : Sins of the Father

Oliver refuses to kill Malcolm in return for Thea's cure, and Malcolm refuses to surrender rulership of the League to save his daughter. Civil war tears through Star City as the two factions fight it out. Meanwhile, Felicity discovers that the Calculator is her father and tests him to see if he can be trusted. Guest Stars: Neal McDonough, Elysia Rotaru, Tom Amandes, Katrina Law, Natasha Gayle, J.P. Mulcaster, Jimmy Akingbola, Charlotte Ross,

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