Numb3rs is a drama about an FBI agent who recruits his mathematical-genius brother to help the Bureau solve a wide range of challenging crimes in Los Angeles. A dedicated FBI agent, Don Eppes (Rob Morrow) couldn't be more different from his younger brother, Charlie Eppes (David Krumholtz), a brilliant mathematician who's yearned to impress his big brother ever since he was little. As a seasoned investigator, Don deals in hard facts and evidence, whereas Charlie, a math professor at a California university, functions in a world of mathematical probability and equations. Now, despite their disparate approaches to life, Don and Charlie are able to combine their areas of expertise and solve some killer cases. This season, Diane Farr joins the cast as Megan Reeves, part of Don's FBI team.