Sydney Driscoll

Sydney Driscoll is a recurring antagonist on Pretty Little Liars. She was a secondary antagonist during Season 5, and a supporting antagonist for Season 7. Sydney is a secret friend of Jenna Marshall during High School but has now returned, working under the under of Uber "A".

She is portrayed by Chloe Bridges.

Season 5
In "Miss Me x 100", Sydney is revealed to be a member of Mona Vanderwaal's Army and is working with Jenna Marshall.

Season 7
In "The DArkest Knight", Sydney distracts Mona Vanderwaal and Caleb Rivers so that Jenna can escape The Radley and try to kill the Liars with Noel.

In "Hold Your Piece", Sydney is sent by Uber "A" to make a donation at the Vogel Vision Institute under their name. She does so and "A.D." communicates with her via text to make sure she completed her task. She claims that "A.D." is just a client who prefers to remain anonymous.

Villainous Deeds

 * Spying on the Liars for Jenna Marshall.
 * Joining Mona's Army to take down Alison.
 * Joining Alison DiLaurentis's Army to take down the Liars.
 * Distracting Caleb and Mona while Jenna and Noel attempt to kill the Liars.
 * Working for Uber "A".

Trivia

 * According to writers, Sydney's story was planned for a few seasons, with Chloe Bridges always sought for the role.