In exchange for his help in stopping Chase, Oliver offers Slade information on the whereabouts of his son. Grant Wilson appears in the DC's Legends of Tomorrow (2016) episode "DC's Legends of Tomorrow: Star City 2046 (2016)" and, rather than his comic book moniker The Ravager, has taken on his father's mantle as Deathstroke.
In early April 2017, Stephen Amell and Marc Guggenheim posted on social media that Manu Bennett would be returning as Deathstroke, including images of the masked character appearing on set. Bennett posted replies stating that he was not returning for Arrow because he was filming his own series, "Shannara" in Auckland, New Zealand.. Guggenheim later posted that fans would be "hearing the voice" of Bennett as Deathstroke, implying that a body double wearing Deathstroke's mask would be used for filming, with Bennett providing only the voice of the character.
Oliver's resistance teams consists of himself, Malcolm Merlyn, Nyssa Al Ghul (Katrina Law), Slade Wilson (Manu Bennett) and Digger Harkness (Nick E. Tarabay) in the fight against Chase. Katrina, Manu and Nick were all series regulars on the television show "Spartacus: Vengeance." Ironically enough Stephen Amell was in the running to be a replacement for Andy Whitfield in the titular role, but he lost to Liam McIntyre. Had he gotten the role, having the other 3 actors follow him into battle would have been a possible occurrence.
Prior to this episode, it was revealed that John Barrowman was not offered a contract to return for the next season in any of the Arrowverse series. Barrowman had a recurring role in the first four seasons of Arrow, and had signed a contract to be a guest or recurring character across all of the Arrowverse series in 2016. In addition to his appearance here, he was a recurring villain in "Legends of Tomorrow" and guest-starred in the musical episode of "The Flash".
During the Flash season 3 finale, Cisco was shown receiving a text from Felicity. According to information from both series, the Flash finale took place several days after the events on Lian Yu, indicating that Felicity might have survived the blast.