Sara Harvey

Sara Harvey is the main antagonist of the third and first half of the fourth seasons of the ABC Family original series "Pretty Little Liars" and the secondary antagonist of the sixth season. She is a member of the A-Team and its seemingly second in command, under CeCe Drake. She is revealed to be Red Coat and the Black Widow. She is the secondary antagonist of the series beginning with season 3-6.

History
Sara Harvey first came into the series in season three, when she took over the "A" game from Mona Vanderwaal and the two of them created a team of "A's" working in tandem together. Sara wore a red coat and Alison mask to conceal her identity from Mona, the A-Team and the Liars. She would walk around town and supervise the Liars, while sometimes overlooking the A-Team missions. The Liars eventually become aware of her existence and try to find out who she is. Spencer arranges a party for Sara to come and meet the Liars, with Mona thinking she's meeting with CeCe, but the Liars hatch their own plan. Toby and Spencer, who have become double agents, are planning on catching her when she exits the plane. But their plan doesn't work out well after someone sets the Lodge ablaze. Sara rescues Mona, Emily and Aria, leaving Hanna to burn and losing her coat in the process. She also burns the side of her mask. Sara leaves her coat behind and takes on the disguise of the Black Widow briefly, until she obtains a new coat in season four. The Liars are still on the hunt to find Red Coat and she begins living under the DiLaurentis home. At the schools Hoedown, Sara makes an appearance and ends up losing her coat again, when the Liars take it from her. The girls soon unmask CeCe Drake as Red Coat and assume that's the end of it. However, Sara returns in her red disguise and is revealed to be working with "A" as her ally. The Liars are still unaware of her existence as the other Red Coat until they see her at Radley after CeCe Drake reveals herself to be "A". CeCe reveals that it was all Sara and then the Liars confront her about it. She claims that she tried to keep Emily safe but Emily punches her.