SINS OF THE FATHER: When Prometheus ups his killing spree, Oliver (Stephen Amell) searches for connections between the victims. Felicity (Emily Bett Rickards) and Curtis (Echo Kellum) discover the victims have a mysterious link to Oliver’s past and this new secret could upend his new team. Meanwhile, Thea (Willa Holland) has a heart to heart with Lance (Paul Blackthorne), and Felicity considers telling Malone (Guest Star Tyler Ritter) the truth about her work. John Behring Directed The Episode Written by Wendy Mericle & Brian Ford Sullivan.