<P> `` A '' is the main antagonist of the series . `` A '' is stalking and torturing the Liars in relentless and creative ways and also threatens their friends and family . In the second season finale , it is revealed that Mona is `` A '' . She is also the `` A '' who stalked Alison before her disappearance . However , when she is sent to Radley sanitarium , she is visited by CeCe Drake , who offers her a partnership and takes over the team of `` A 's '' , known as the A-Team . </P>
<P> `` A '' is the main antagonist of the series . `` A '' is stalking and torturing the Liars in relentless and creative ways and also threatens their friends and family . In the second season finale , it is revealed that Mona is `` A '' . She is also the `` A '' who stalked Alison before her disappearance . However , when she is sent to Radley sanitarium , she is visited by CeCe Drake , who offers her a partnership and takes over the team of `` A 's '' , known as the A-Team . </P>
who is the person sending messages in pretty little liars
who is the person sending messages in pretty little liars
Mona
Mona