Keegan Allen: Keegan Allen. Actor: Pretty Little Liars. Keegan Allen received his breakout role in ABC Family's hit series Pretty Little Liars (2010), based on the novels by Sara Shepard. He portrayed the mysterious "Black Cat" character, "Toby Cavanaugh".
Allen has also made small appearances in TV shows, such as Nickelodeon's Big Time Rush (2009) and CSI: Crime Scene Investigation (2000).