Alan Eppes (Judd Hirsch) has two sons. Don (Rob Morrow) is the dedicated Los Angeles FBI agent. His younger brother, Charlie (David Krumholtz), is the brilliant mathematician. The two brothers couldn't be more different, but they find a common ground when collaborating to solve complicated crimes in Numb3rs. Don is also assisted by fellow agents Megan Reeves (Diane Farr), David Sinclair (Alimi Ballard), and Colby Granger (Dylan Bruno), while Charlie finds insight and encouragement from a co-worker, Dr. Larry Fleinhardt (Peter MacNicol), and Amita Ramanujan (Navi Rawat), Charlie's former grad student. Season Four of Numb3rs brings Don and Charlie together on perplexing cases ranging from a mass poisoning at a cult compound to a death connected to the secret world of reality games. This five-disc, 18-episode DVD set contains all of the compelling cases from the fourth season of the series Newsweek magazine calls "...a gripping hour of TV, with unexpected shades of character, crisp acting, and enough geek-wizardry to excite anyone..."