Keegan Allen's career took a significant turn with his pivotal role in the widely popular ABC Family television series, Pretty Little Liars, which was inspired by the novels penned by Sara Shepard. His portrayal of the enigmatic character, Toby Cavanaugh, also known as the "Black Cat", marked a notable milestone in his acting journey.
In addition to his breakout role in Pretty Little Liars, Allen has also made brief appearances in other notable television shows. One such example is his role in the Nickelodeon series, Big Time Rush, which premiered in 2009. Furthermore, he has also made appearances in the long-running crime drama, CSI: Crime Scene Investigation, which first aired in the year 2000.