Coming up on the second anniversary of Alison's disappearance, Aria, Emily, Hanna and Spencer are thrown back into turmoil after one shocking night in "It Happened 'That Night'," the season three premiere of ABC Family's hit original series "Pretty Little Liars."

Coming up on the second anniversary of Alison's disappearance, Aria, Emily, Hanna and Spencer are thrown back into turmoil after one shocking night in "It Happened 'That Night'," the season three premiere of ABC Family's hit original series "Pretty Little Liars."