After Prometheus attacks Curtis, Oliver realizes Prometheus knows all of Team Arrow’s secret identities and is planning to come for them one by one. Felicity and Detective Malone discover a clue that links Prometheus to Oliver’s past.
Oliver wakes up to a life where he never got on The Queen’s Gambit. Robert and Moira Queen are alive and well. Laurel is his loving fiancée and their wedding is imminent.
When the bodies of two criminals are dropped at SCPD, Oliver realizes there is a new Vigilante in Star City. The team is split about whether they should stop someone who is helping keep the city safe.
When Prometheus ups his killing spree, Oliver searches for connections between the victims. Felicity and Curtis discover the victims have a mysterious link to Oliver’s past and this new secret could upend his new team.
When Tobias Church captures and tortures one of Oliver’s new recruits, Oliver must turn to an old friend, Christopher Chance AKA the Human Target, for help. Meanwhile, Felicity’s worlds collide when Detective Malone joins the ACU.