Numb3rs (CBS) Returns: Friday, April 4 at 10:00 pm ET So Far This Season: Harnessing the universal language of mathematics, Charlie (David Krumholtz) and Don (Rob Morrow) solve crimes, while their father (Judd Hirsch) complains about the lack of quality deli alternatives in Los Angeles. When It... Alimi Ballard and Rob Morrow on 'Numb3rs' photo courtesy of CBS