<Li> Janel Parrish portrays Mona Vanderwaal , the original and first `` A '' . She is the person who stalked Alison before her disappearance , and did this as revenge for Alison crowning her `` Rosewood 's biggest loser '' . After Alison disappeared she became best friends with Hanna Marin and they transformed themselves into the most popular girls at school , taking Alison 's place . In the season two finale she is exposed as `` A '' and sent to Radley Sanitarium , where she is visited by CeCe Drake ( Charlotte ) , who takes Mona 's place in the `` A '' game . In Season 3 , she continues working as `` A '' and by the end of the season is kicked off the `` A '' team and becomes a victim of `` A '' along with the other girls . In Season 4 she helps the girls out with their investigations of the new `` A '' . In season 5 she creates an army so as not to be intimidated by Alison 's return . Later in the season , she fakes her own death to ferret out `` A '' but is kidnapped by `` A '' and imprisoned in `` A '' 's dollhouse . After the time jump , Mona is working for Veronica Hastings ' rival for State Senator , and is revealed to be Charlotte Drake 's killer . </Li>
<Li> Janel Parrish portrays Mona Vanderwaal , the original and first `` A '' . She is the person who stalked Alison before her disappearance , and did this as revenge for Alison crowning her `` Rosewood 's biggest loser '' . After Alison disappeared she became best friends with Hanna Marin and they transformed themselves into the most popular girls at school , taking Alison 's place . In the season two finale she is exposed as `` A '' and sent to Radley Sanitarium , where she is visited by CeCe Drake ( Charlotte ) , who takes Mona 's place in the `` A '' game . In Season 3 , she continues working as `` A '' and by the end of the season is kicked off the `` A '' team and becomes a victim of `` A '' along with the other girls . In Season 4 she helps the girls out with their investigations of the new `` A '' . In season 5 she creates an army so as not to be intimidated by Alison 's return . Later in the season , she fakes her own death to ferret out `` A '' but is kidnapped by `` A '' and imprisoned in `` A '' 's dollhouse . After the time jump , Mona is working for Veronica Hastings ' rival for State Senator , and is revealed to be Charlotte Drake 's killer . </Li>
who is a in the tv show pretty little liars
who is a in the tv show pretty little liars
Mona Vanderwaal
Mona Vanderwaal