<P> Noel Kahn returned to Rosewood to team up with Jenna Marshall and Sara Harvey . Kahn served as one of Charlotte's former minions and worked for her at the Dollhouse, having been responsible for placing blood all over Spencer Hastings to convince she had hurt someone . Noel became the prime suspect for Uber A, particularly after Alison reveals that he pushed a girl down a flight of stairs when he was drunk during a UPenn frat party . Hanna abducts him at the end of "The Wrath of Kahn" in an attempt to obtain a video confession that proves he's their tormentor . In the following episode "The DArkest Knight", she instead ends up slashing his leg with a knife in order to test his DNA and see if it matches Mary Drake's . The results later come back negative and Kahn ends up escaping . Noel and Jenna later lure the Liars to an abandoned school for blind students so they could be held hostage and eventually murdered . During a cat - and - mouse chase, Kahn ends up stumbling upon an axe that decapitates his head after failing to fight Emily and Hanna . In the following episode, "Playtime", Detective Marco Furey informs Spencer that Jenna and Noel frequently visited Archer Dunhill at Welby . During "These Boots Were Made for Stalking", Jenna walks into the police station in order to come clean about her actions and interrupts a conversation between Spencer and detective Marco Furey . Marshall reports that she kept a low profile after the events that took place at the abandoned school for blind students to avoid being harmed by Noel . According to Jenna, Noel was accountable for Sara Harvey's homicide and she feared to be his ensuing victim . Kahn recruited Jenna with the assertion that Charlotte left enough money in her will to afford Marshall another eye surgery . Nevertheless, Jenna suspected Noel of stealthily plotting to steal the cash all to himself since his parents had financially cut him off . In an attempt to spare her life, Marshall brought a gun to the deserted sight school as an act of self - defense and pretended to hold a grudge against the Liars . However, when Caleb later confronts Jenna about the authorities detecting holes in her allegations, she informs him that the only person who could contradict her side of the story was Noel . </P> <P> Aria is "A.D.'s" helper . Aria is given the offer to join the team in "Power Play". She accepts in the following episode and begins supplying information to Uber A. After the Liars discover Lucas' graphic novel, Aria is sent by Uber A to retrieve it . Once she delivers it, she is given an "A" hoodie in return . She breaks into Alison's house sporting the disguise and trashes the nursery for her baby . In the next episode, Aria is sent by "A.D." to deliver a "gift" to the Hastings family . She connects to their Bluetooth and leaves a burner phone there to play a video recording of Peter and Mary discussing Jessica's murder . She later gets back into her "A" disguise and breaks into Alison's house to put the puzzle piece onto the and retrieve her file . "A.D." contacts Aria again and gives her a phone to communicate on . "A.D." asks Aria to meet them and to wear the uniform to do so . Mona overhears the call and tells the Liars of Aria's involvement with the A-Team . Aria gets into her "A" hoodie and goes to meet "A.D.", only to be confronted by the Liars . She then officially defects from the team and rejoins the Liars . </P> <P> Mary joins the A.D. - Team after the time jump, when Alex helps break her out of prison and then helps her with kidnapping Spencer and keeping her locked away in their bunker . When Alex tries to kill Spencer, Mary tries to convince her to just keep her locked up, but Alex refuses and punches her to keep her from interfering . Mary and Alex are then kidnapped by Mona and kept as her dolls in her own personal dollhouse . </P> <P> Wren is one of the helpers to Alex . He shoots her so that she will have the same scar as Spencer and then later comes to Welby to kill her as "A.D." for Alex, only stopping once Mona says she can help get Mary out . Alex kills Wren so that she doesn't have to break up with him in order to get her endgame wishes . Despite Wren being the only person to know almost everything about Alex's game, he doesn't participate much during the actual game, only doing a few things for Alex . </P>

Who works for a in pretty little liars