Katie Cassidy is set to topline director John Suits’ upcoming mind-fuck Scribbler. The 25-year-old stunner will play a woman undergoing an experimental treatment to eliminate the multiple personalities that torment her, but who is fearful of losing her true identity in the process.

Cassidy joins a cast that includes fellow hotties Eliza Dushku (“Doll House”), Michelle Trachtenberg (“Buffy the Vampire Slayer”), Gina Gershon (Killer Joe),  Ashlynn Yennie (Human Centipede), T.V. Carpio (Limitless) and Sasha Grey (Face Invaders 4).

Scribbler is written by Daniel Schaffer, adapted from his 2006 graphic novel. Michael Imperioli (“The Sopranos”), Billy Campbell (“The Killing”), Garret Dillahunt (Last House on the Left) and Kunal Nayyar (“The Big Bang Theory”) round out the cast.

Cassidy, daughter of ’70s teen idol David Cassidy, has starred in a string of notable genre projects including Platinum Dunes’ A Nightmare On Elm Street, Dimension’s Black Christmas, Screen Gems’ When a Stranger Calls and the short-lived CBS mystery series “Harper’s Island.”

She  was also tapped as the female lead on The CW pilot “Arrow,” an adaptation of DC Comics’ “Green Arrow,” starring Stephen Amell as the vigilante superhero.