"So It Begins" is the sixth episode of the fifth season of Arrow, and the ninety-eighth episode overall. It aired on November 9, 2016.


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. Meanwhile, Thea has a heart-to-heart with Lance, and Felicity considers telling Malone the truth about her work.[1]


Preparation ran from August 22 until August 30, 2016. Shooting ran from August 31 until September 12, 2016, with a break for Labor Day on September 5.[2]




  • When Prometheus leaves the message "so it begins" for the Green Arrow, Felicity suggests that he is a Babylon 5 fan, referencing a phrase frequently said by Kosh.
  • Anatoly Knyazev shows himself to be another one of Oliver Queen's mentors in different skills, teaching him to make bombs and work with electronics.
  • This episode marks the first major appearance of The List since Season 1.


  1. Arrow #5.6 Spoiler Description: “So It Begins” - GreenArrowTV
  2. Marc Guggenheim (@mguggenheim) - Twitter