what season does alison return in pretty little liars
Alison DiLaurentis After the girls find Alison's diary, they try to understand her. Throughout the season, Alison is shown in several flashbacks concerning her behavior, mostly based on histories written on her diary.[26][27][28][29][30][31] The girls later meet Carla Grunwald, who tells them that she helped Alison step out of the grave that she was buried; Grunwald then drove her to a hospital, but Alison ran away.[32] With this confirmation, the girls start a quest to find Alison, following the steps of two persons using the Red Coat costume, one of them being revealed to be CeCe. Fortunately, after a Halloween party, the girls follow a Red Coat, who is revealed to be Alison. She tells the girls that she needs their help, but she vanishes shortly after.[33] Alison later appears to Emily and starts requesting things to her.[34][35] The season ends when Alison sits down with her friends to explain everything that had happened to her two years earlier.[36]
Alison DiLaurentis After Ian Thomas is pushed down by "A" from the top of a bell tower and his body goes missing, the girls are forced to keep their friendship a secret and to maintain therapy sessions with Dr. Anne Sullivan to discuss about Alison's absence in their lives, a fact that their parents believe to be the reason why the girls are behaving strangely.[16] Days after, through Spencer's sister Melissa Hastings, the girls find Thomas' dead body, accompanied by a suicide letter in which he admits that he killed Alison.[17] Following, the girls continue to be threatened by "A." Garrett Reynolds is arrested for Alison's murder after Jenna Marshall hands the Rosewood Police Department a missing page of Alison's autopsy.[18] The second season ends when Mona Vanderwaal—a Rosewood High student and one of Alison's victims of bullying when she was alive—is revealed as "A."[19]
Pretty Little Liars (season 7) One year later, Mary escapes from prison and Mona is released from Welby but rejoins the A-Team and is sent to kidnap Spencer, who comes face-to-face with A.D. â€“ Alex Drake, her twin sister. Mary reveals she sold Alex to a London family to get out of Radley. Alex ran away and met Wren who revealed everything about Spencer to her and introduced her to Charlotte who left her everything. She became A.D. to use the Liars to find Charlotte's killer and killed Wren as he always saw her as Alex while she wanted to become Spencer to have her "perfect life". She explains that Sara was looking for Charlotte's false treasure in the Radley which was actually the secret file and Jenna recruited Noel to look for "Charlotte's sister". Jenna uses her enhanced sense of smell to figure out "Spencer's not Spencer" and alerts Toby who tells the others. Mona reveals to them that Wren was going to kill her but she convinced him she could get Mary out. The Liars, Toby, Mona, and Caleb come face to face with Alex and Spencer as they cannot tell them apart, until Toby makes the distinction by asking what Spencer's favorite poem from a book she gave him. Mona tracked A.D.'s location has a cop arrest her. The Liars then say goodbye to one another as Aria leaves for her honeymoon with Ezra. Mona moves to Paris and the "cop" is revealed to be her boyfriend who has imprisoned Alex and Mary in her basement dollhouse. In the finale moment, a new set of liars are awaken to find their leader, Addison, has just gone missing.
Elena Michaels Elena eventually returns to Clay, and they try to make their relationship work again. She helps the pack and learns to live with Clay despite their differences.