<P> In "The Wrath of Kahn", Spencer and Emily find a flash drive at The Kahn's cabin filled with footage from the time they were held captive in Charlotte's Dollhouse . After watching one of the videos, they discover that Noel Kahn was helping Charlotte torture them . During this episode, Aria and Jason team up to find out more details in regards to Mary's past and discover that Steven Kahn, Noel's father, orchestrated the adoption of Drake's second child . </P> <P> Near the ending of "The Darkest Knight", Jenna and Noel both attempt to murder the Liars, partly for their own reasons but to also avenge Charlotte, whom according to Kahn "taught them a lot". During the cat - and - mouse chase, Noel ends up stumbling upon an axe that decapitates his head and Marshall is knocked down by Mary Drake just as she was about to shoot Spencer Hastings . Once the Liars stumble upon Spencer being cradled on Mary's arms, they deduce she's accountable for their friend's critical condition . Mary swears she'd never harm Spencer as she tearfully claims to be her birth mother, thus revealing that Spencer is Charlotte's biological sister . </P> <P> 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, Kahn was accountable for Sara Harvey's homicide and she feared to be his ensuing victim . He 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 . Later in the episode, Caleb threatens Marshall by warning her that the cops were uncovering inconsistencies in her allegations . However, Jenna assures him the police won't be able to prosecute her since Noel was the only person who could contradict her statement . </P> <P> In "Power Play", Hanna is hanging out at Spencer's house when she spots a P.I.'s business card from Peter's briefcase . She convinces Spencer to infiltrate the investigation in order to locate Drake, and theorizes that Mary might be able to help point them in the direction of "A.D.". Afterwards, Hanna picks up the phone and calls the P.I., pretending to be someone from Peter's office . After getting help from the P.I., Hanna and Spencer knock on several doors until they approach one house and much to their surprise, Pastor Ted Wilson (Hanna's former step - dad) opens the door . The girls show Ted a picture of Drake and ask him if he has seen her, to which Wilson informs them that he hasn't . Hanna offers to grab coffee with Ted at the Radley later to catch up, and she also asks him to call her if he happens to spot Mary . As the Liars turn away to leave, Drake shows up in the doorway . Ted turns to Drake and questions her on what she's truly doing there . Later, he reaches out to Hanna to talk and they meet up at Lucas' loft, where Wilson reveals to have lied about Mary's visit . Ted further confesses that Drake is an ex-girlfriend of his back when he was a college student and that she met up with him to inform they had a child together . Things get even more intricate when Wilson discloses to Hanna that said offspring was Charlotte and that he met his daughter prior to her sex change . It turns out that Ted used to run a summer camp for troubled boys, and Charles was a camper there . Wilson is disheartened when describing that he interacted with a "soft - spoken, sweet" boy without awareness they were related . Ted then showcases Hanna a picture of himself back when he worked at the camp, chaperoning Charles and Lucas Gottesman, whom he described as his son's "only friend". This revelation leaves Hanna stunned . </P>

When do they find out who charles is pll