Some key subtractions and additions invigorate the engrossing third season of this smart series about an FBI team led by Don Eppes (Rob Morrow) who gets assistance on its toughest cases by Don's brother, Charlie (David Krumholtz), a mathematical genius. Peter MacNicol, as eccentric physics professor Larry Fleinhardt, Charlie's mentor, departed mid-season for a stint on 24. Diane Farr, as FBI profiler Megan Reeves, left on maternity leave. Enter Kathy Najimy as Charlie's new boss, Mildred ("Millie") Finch, and the exotic Aya Sumika as Special Agent Liz Warner, to give the show what the creators call, in a bonus season retrospective, "more girl energy." What separates Numb3rs from TV's other, and more grisly, procedural shows is that it emphasizes brains over bleech and intellect over ick. Enjoyment of Numb3rs is not dependent on your knowledge of "multi-attribute compositional models," "hidden variable theory," or "quadratic discriminate analysis," Just do what the confounded agents on Don's team do whenever Charlie explains how he applies his "intuitive synthesis of established mathematical principles and theorems" to manhunting: "Nod your head and wait for the punchline." Big picture, the cases are compelling in themselves: a psyche-scarred teacher and her young lover embark on a murder spree; a valuable painting originally stolen by Nazis is heisted from an art gallery; someone is bent on killing, not catching, child predators; a music mogul's son is kidnapped; a sinkhole that destroys a school playground reveals the cover-up of illegal toxic waste dumping.

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