Charles DiLaurentis is the main antagonist of the third, fourth and fifth seasons of "Pretty Little Liars". Charles is the older sibling of Alison and Jason DiLaurentis. Charles is "A" and the leader of the A-Team, known as Big A. Big A is the mastermind behind the bullying and blackmail of the Liars. Charles' main goal was to ruin the Liars lives.
In the fifth season finale, Charles kidnaps the Liars and locks them inside their life size dollhouse.
In "Game Over, Charles", it is revealed that Charles is actually CeCe Drake, who was born as Charles but later became Charlotte DiLaurentis.