The finale revolves about Oliver Queen (Stephen Amell), who is now in a desperate search for his son William, who has been kidnapped by Adrian Chase (Josh Segarra).
Chase has gathered an army including Laurel Lance / Black Siren (Katie Cassidy) and his mercenaries to give the final confrontation against Oliver and returns to the place where everything began: Lian Yu.
With no options, Oliver teams up with Malcolm Merlyn (John Barrowman), Nyssa al Ghul (Katrina Law) and releases Slade Wilson (Manu Bennett) and Digger Harkness (Nick E. Tarabay) in order to help him fight against Chase.
Slade rejects an offer to join Harkness and helps Oliver's group overcome their adversaries, saving Felicity Smoak, Curtis Holt, Thea Queen, and Samantha Clayton.
Oliver, Slade, and Nyssa go to save Dinah Drake, John Diggle, Quentin Lance, and Rene Ramirez, while Malcolm leads the others to safety.
Jesse Schedeen of IGN gave the episode a "masterpiece" 10 out of 10 and wrote in his verdict, "Arrow truly cemented its comeback with tonight's season finale.
It succeeded in bringing Ollie's story full circle, making strong use of some very welcome guest stars and giving the Prometheus conflict the dramatic finish it deserved.
Other episodes have had bigger action beats, better observed character moments, stronger points to make about who Oliver is and what his existence as the Green Arrow means.
That sense of culmination makes tonight's episode something special, bringing what is effectively a decade's worth of story to an end... only to blow everything up.
"[7] Andy Behbakht of TV Overmind gave the episode a perfect 5 star rating out of 5 and wrote "Let's take a moment to applaud the brilliance of both Stephen Amell and Josh Segarra, who brought out the very best acting from each other this season on Arrow.
Looking ahead, I'm hoping for a big bad who can top Adrian Chase, more Dinah, a swift resolution to Rene's custody battle, the return of Rory, Thea back full time, and a happy, drama-free Olicity in season 6.
"[9] Lindsay Macdonald of TV Guide wrote positive about the episode, stating "It's true that season finales usually come with a bodycount, but killing off the entire cast besides Oliver and his son?