Sins of the Father
Season 4 - Episode 13
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.
|Aired On:||Wednesday 10th of February 2016 on The CW ( US )|