This week "Arrow" hit a milestone -- 99 episodes -- with its newest episode "Vigilante." Not only did this episode debut the comic book character Vigilante, but it provided two new clues to the identity of Prometheus. When last week's episode ended with Quentin Lance holding one of Prometheus' throwing stars, it was easy to assume Quentin could have been connected to the villain. This week attempted to clarify that no matter how dark Quentin's grief and addiction had taken him, he could never be a killer like Prometheus. While Prometheus was scarce this week, he did make a surprise appearance at the end of the episode. He came out of hiding to meet Artemis, who apparently is working with the masked killer. This week's episode also showed Oliver's dealings with Kovar in the flashbacks, the latter of whom not only knew that Oliver was there to kill him, but kill him over the promise he made to Taiana last season. This will be "Arrow's" last episode until after Thanksgiving when it's 100th episode is set to air.

A City of Vigilantes

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A new vigilante rose on this week's episode of "Arrow," a masked assailant with advanced weapons and headgear. This Vigilante (as he called himself) targeted a sex trafficking ring and a crew of bank robbers. Unlike the vigilantes who had come before him, like Black Canary in her early days and even Arsenal, this Vigilante was not afraid to kill anyone he deemed unworthy. This Vigilante even went toe-to-toe with the Green Arrow and told him that he wasn't saving the city. Vigilante's rise was reminiscent of Ray Palmer's first time out in the A.T.O.M. suit last season when he blindly confronted the Green Arrow (and got his butt handed to him.) While neither the Green Arrow nor his team could apprehend Vigilante in this episode, at some point they'll have to decide if they should let him continue fighting crime without a moral code or if they have to bring him in. Oliver made a good point when he called the team out for judging his early days as a killer and how he had to learn restraint. Every villain the team faces this season is like a mirror for the Green Arrow to peer into. When he looks at the Vigilante he sees his first years as the Hood -- ruthless, wild, and willing to kill. He sees the same in Prometheus. Both of these characters are providing reflection points for Oliver this year, to see how far he's come, and if he still has ways to go, in terms of his moral compass.

Team Arrow Pulls Off a Heist

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Tonight was one of the first episodes of Season 5 where the team worked well together. Felicity led the charge and coordinated multiple take-downs tonight, including a fake heist to trap Vigilante. Tonight it felt like the new recruits were actually a part of Team Arrow. Ragman, Artemis, Mr. Teriffic, Spartan, and Wild Dog were all able to work together tonight flawlessly. At one point Diggle -- the most seasoned member of the team -- went a little overboard when roughing up a bad guy for information. Wild Dog had to talk Diggle down, which was similar to when Diggle  helped Rene get back on his feet after being tortured by Tobias Church.Rene even helped Diggle see Lyla and John Jr., the first time we've seen him since the creation of Flashpoint. The team was able to trap Vigilante temporarily, unfortunately Mr. Terrific had to take the worst blows by being punched by Vigilante and shot with an arrow by Oliver (that moment was very "shoot the the hostage" from the movie "Speed.") Vigilante got away, but the team was able to take down the real criminals of the episode -- a team of violent bank robbers.

The Truth Must Out 

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Arrow -- "Canary Cry" -- Image AR419a_0166b.jpg -- Pictured: Paul Blackthorne as Detective Quentin Lance -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

It legitimately felt last week that Quentin Lance could have something to do with the identity of Prometheus. Was Quentin blacking out and taking on the dark personality of the Green Arrow? Was Quentin committing violent crimes as a way to cope with Laurel's death? The episode seemed to suggest that Quentin was not Prometheus himself, but Prometheus' target, a way to taunt someone in Oliver's life. After confessing his blackouts, arm cut, and throwing star to Thea, Thea decided to check Quentin into a rehab facility. They shared a heartbreaking moment in the parking lot where both Thea and Quentin acknowledged just how much they have loved and lost in the last four years. Quentin temporarily tendered his resignation as Deputy Mayor and will remain in rehab until he can process his grief and overcome his alcohol addiction.

A Trojan Horse

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The final moments of the episode revealed a shocking secret: Artemis is working with Prometheus. So far no clues have been given as to why she's working for him or if she even knows his true identity. This illuminates why, when she was fighting Prometheus last week, he didn't harm her or kill her. That fight did seem way too easy, considering she was such a fresh recruit. She also cut Prometheus' arm in the same place that Lance had his cut, so maybe she cut Lance's arm when he was asleep and planted the throwing star on him. Two questions now remain: does she know Prometheus' true identity and does she agree with why he is targeting Oliver? So far the major theories for Prometheus' identity include Tommy Merlyn, Robert Queen, Quentin Lance, and Billy Malone. Quentin seems safe for now and both Tommy and Robert are dead. That leaves Billy Malone, who wasn't in this episode. Why would Artemis want to help him? What does she know that we don't? Her betrayal was also echoed in the flashbacks this week, as Kovar, after torturing Oliver for a week, was actually working with the Bratva and Taiana's mother. The show will have a lot to answer for when it returns, especially now that Team Arrow has a mole in its ranks.

100 Episodes of Arrow

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When "Arrow" returns on November 30, it will be airing its historic 100th episode. This episode will have a personal impact for each character on the show and it will be night three of the four-night crossover. Laurel Lance, Robert Queen, Moira Queen and even Deathstroke are all set to guest star in the episode -- which is set to pay homage to "Arrow's" five-year history.

ARROW CELEBRATES 100 EPISODES; THE EPIC SUPERHERO CROSSOVER CONTINUES — Oliver (Stephen Amell) wakes up to a life where he never got on The Queen’s Gambit. Robert (guest star Jamey Sheridan) and Moira Queen (guest star Susanna Thompson) are alive and well. Laurel (guest star Katie Cassidy) is his loving fiancée and their wedding is imminent. Everything seems perfect, but Oliver starts to notice small imperfections that make him question this new reality. Meanwhile, Felicity (Emily Bett Rickards) and the recruits take on a new threat with help from The Flash (guest star Grant Gustin) and Supergirl (guest star Melissa Benoist). James Bamford directed the episode with story by Greg Berlanti and written by Marc Guggenheim & Wendy Mericle (#508). Original airdate 11/30/2016.

Starring Stephen Amell as the Emerald Archer, “Arrow” airs Wednesdays at 8 pm ET/PT on The CW. The series also stars Emily Bett Rickards, David Ramsey, John Barrowman, Willa Holland and more.