NUMB3RS (season 2)

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This article contains the list of episodes from season 2 of the CBS television series NUMB3RS. Season 2 premiered on 23 September 2005 and its season finale was on 19 May 2006. Season two sees several changes to Don's FBI team: Terry Lake is reassigned to Washington DC and two new member join Don and David Sinclair, Megan Reeves and Colby Granger. Charlie is challenged on one of his long-standing pieces of mathematical work and also starts work on a new theory, Cognative Emergence Theory.

Screenshot	Title	Writer	Director	Original Airdate	#
	Judgment Call	Ken Sanzel	Alex Zakrzewski	September 23, 2005	201
	When a judge's wife is shot and killed, Don and his team look into the judge's cases to determine if one of his verdicts led to the murder. Using the judge's past rulings and Megan's expertise in profiling, Charlie creates a mathematical theory to identify the two most probable suspects from the case files. However, when the team discovers a link between the two suspects, the investigation goes in an unexpected direction. Guest stars: Alan Rosenberg and Sarah Carter Mathematics used: Scatterplot, bayesian spam filtering and conditional probability
	Better or Worse	Andrew Dettman	J. Miller Tobin	September 30, 2005	202
	Don and his team are called in when a woman attempting to rob a jewelry store in Beverly Hills is shot by a security guard. Charlie assists the FBI by using the keyless remote from the woman's car to help identify her and locate the store owner's kidnapped wife and daughter. Guest stars: George Coe and Jay Karnes Mathematics used: Von Neumann cellular automata and pseudo-random numbers
	Obsession	Robert Port	John Behring	October 7, 2005	203
	The FBI becomes involved in the stalking of a popular singer after she is threatened by an intruder in her house and reveals a series of threatening letters she's received through the mail. Charlie determines the letters are from two different people after analyzing the handwriting. When a photographer is found dead near the singer's house, Don believes the photographer was murdered and his death is somehow related to the stalking case. Guest stars: Johnny Whitworth, Samaire Armstrong and David Moscow Mathematics used: Trigonometry, art gallery problem
	Calculated Risk	J. David Harden	Bill Eagles	October 14, 2005	204
	Don and Megan are called to the murder scene when the CFO of a powerful energy company — who was about to testify against her fellow executives — is murdered at her home and her son is the only witness. Knowing there could be thousands of disgruntled ex-employees, Don asks Charlie to narrow the list. Guest stars: Sarah Carter, Jeff Perry and Richard Fancy Mathematics used: Conditional probability and compound interest
	Assassin	Nicolas Falacci, Cheryl Heuton	Bobby Roth	October 21, 2005	205
	Along with David Sinclair and new FBI Agent Colby Granger, Don discovers a secret code during a raid and enlists Charlie's help to crack it. Using an elaborate game theory model called "hide and seek," Charlie discovers that it is a plan for the assassination of a Colombian exile living in Los Angeles. Charlie and Megan combine their expertise and work closely together to try to prevent the murder from taking place. Guest stars: Jordi Vilasuso, Carol Locatell and Elizabeth Peña Mathematics used: Game theory and paper plane
	Soft Target	Don McGill	Andy Wolk	November 4, 2005	206
	A week-long series of counter-terrorism exercises are put to the test by Homeland Security in Los Angeles, but when the first one is violated by someone who releases a potentially lethal gas in the subway system, Don and his team are called in to find the culprit. Further investigation leads them to an unlikely suspect trying to prove a point about the city's lack of preparedness. Guest stars: Scott Cohen, Lynn Chen, Melinda Page Hamilton, Christina Chang and John Heard Mathematics used: Percolation theory
	Convergence	Nicolas Falacci, Cheryl Heuton	Dennis Smith	November 11, 2005	207
	Don investigates a series of home invasions in which the thieves steal only high-end items from wealthy individuals. In the latest robbery, a father is killed trying to protect his family. Meanwhile, Charlie becomes upset when a rival theoretician challenges his most famous work and states that it is flawed. Alan prepares to open his own consulting business. Guest stars: James Lancaster and Colin Hanks Mathematics used: Group theory and projectile motion
	In Plain Sight	Julie Hébert	John Behring	November 18, 2005	208
	Megan feels responsible for an agent's death following an explosion at a house where meth is being illegally produced and that the FBI targeted for a bust. While several men are arrested in the raid, the kingpin gets away and it's discovered he may also be involved in child pornography. When Charlie learns this and sees a disturbing picture of a young girl at the raid site, he becomes obsessed with finding her. Guest stars: Sarah Carter Mathematics used: Flock behavior, steganography and matrices - error correction code
	Toxin	Ken Sanzel	Jefery Levy	November 25, 2005	209
	Don learns that someone is poisoning non-prescription drugs made by a leading pharmaceutical company after four people nearly die from the tampering. The perpetrator then publishes a manifesto in a local paper that leads Don to believe that the person may be a former employee of the drug company. Later, Larry shares his theory of the case with Megan and he discovers that he's attracted to her. Guest stars: Patrick O'Connell, Lou Diamond Phillips and Connor Trinneer Mathematics used: Information theory - information entropy, graph theory - Seven Bridges of Königsberg and soap bubble theory with Steiner tree
	Bones of Contention	Christos Gage, Ruth Fletcher	Jeannot Szwarc	December 9, 2005	210
	A woman researcher who specializes in Native American antiquities is attacked and killed at the museum where she works. The museum is located on federal land so the FBI is called in. Don's investigation reveals that the woman was working late at night on a secret project that involved the carbon dating of an object. Don and Charlie become worried about their dad after they learn that he is still holding on to his late wife's clothes, which he supposedly gave away months ago. Guest stars: Clyde Kusatsu, Kate Burton, Liz Sheridan, Graham Greene, Reed Diamond, Lorraine Toussaint and Jane Carr Mathematics used: Exponential decay and Voronoi diagram
	Scorched	Sean Crouch	Norberto Barba	December 16, 2005	211
	An arsonist believed to be part of an extremist environmental group sets a fire at a car dealership that kills a salesman. The group's name is spray painted at the scene. It's the fourth such fire, but the first to claim a life. The activist group denies setting the blazes, which leaves Don with the task of determining whether it is responsible or someone else. Charlie and Dr. Fleinhardt, with the aid of a CalSci engineering professor ("Bill Nye the Science Guy") working in the school's combustion laboratory, try to figure out if there is a pattern to the fires by attempting to recreate a backdraft that would help provide a profile of the arsonist. Guest stars: Bill Nye, A.J. Trauth, Blake Bashoff and Loren Dean Mathematics used:
	The OG	Andrew Dettman	Rod Holcomb	January 6, 2006	212
	When Don and his team are called to the murder scene of a Los Angeles gang member, they learn the victim is a fellow agent who had been working undercover. Without exposing the agent's cover, Don must investigate his murder by a rival gang and try to crack the gangs' leadership and territories to find the suspect. However, the agents are surprised when they learn who is responsible for the source of the rivalry. Guest stars: Will Patton Mathematics used: Poisson distribution and social network analysis Trivia: The title for this episode stands for "Original Gangsta", an old gang term.
	Double Down	Don McGill	Alex Zakrzewski	January 13, 2006	213
	When the FBI is called to investigate a murder at a Los Angeles card club, it leads the agents to unravel a complicated card counting scheme involving a group of college students whose lives may now be at risk. Guest stars: Ethan Phillips, Clara Bryant and Taylor Cole Mathematics used: Probability involving sampling without replacement, time series analysis and randomization Trivia: Annie Duke makes an appearance as a blackjack dealer at the card club and Ben Mezrich appears as a blackjack player, whose bestselling book, Bringing Down the House, tells the true story of the MIT students who took Vegas casinos for millions in the late 1990s. Jeff Ma and Matt Lau, two former MIT students who were involved in the scam, also appear as blackjack players in the episode.
	Harvest	J. David Harden	John Behring	January 27, 2006	214
	A Southeast Asian teenager is found in the blood-spattered basement of an old downtown hotel where she was apparently being tortured. The investigation soon reveals that the girl, along with three other missing women, are victims of a black-market organ-harvesting scheme. Don and Charlie try to find the remaining women before their organs are taken. Amita also helps by communicating with the teen, who is from the same area of India where Amita's family once lived. Guest stars: P.J. Brown and John Gowans Mathematics used: Markov chains, ellipses and direct variation with the square
	The Running Man	Ken Sanzel	Terrence O'Hara	February 3, 2006	215
	A DNA synthesizer with the capability of customizing diseases is stolen from the campus where Charlie teaches, and Don fears the thieves may be terrorists out to start or advance a bio-warfare program. He also believes the theft was an inside job and the chief suspect is one of Larry's top students. At home, Charlie discovers his late mother was once a gifted musician. Guest stars: Kirk Acevedo, Daisy Eagan, Mike Snyder and Charlie Hofheimer Mathematics used: Benford's law, continued fraction and probability
	Protest	Nicolas Falacci, Cheryl Heuton	Dennis Smith	March 3, 2006	216
	A pedestrian is killed when a homemade bomb explodes under a car outside of a downtown Army recruiting center. The investigation reveals that a similar bombing occurred exactly 35 years ago at an ROTC office that killed two people. The bomber was identified but never captured. A retired agent who worked the first crime is brought in to help with the new case, and Don must determine whether the original bomber has resurfaced or if a copycat is responsible. Guest stars: Mary Kay Place, Concetta Tomei and Robert Forster Mathematics used: Graph theory, Ramsey numbers, recursive sequence Trivia: The dust jacket of the book "Essays on Revolution" says it is edited by Nicolas Falacci and Cheryl Heuton, the show's creators.
	Mind Games	Andrew Dettman	Peter Markel	March 10, 2006	217
	When the bodies of three illegal-immigrant women are found on government-owned land in a wilderness area, Don investigates and learns a psychic led the police to the crime scene after allegedly seeing visions of the bodies. The probe also reveals the women were cut open and religious artifacts were spread around their remains. When Charlie learns a psychic is helping with the case, he is outraged and sets out to prove the man is a fraud. Guest stars: Jacob Vargas and John Glover Mathematics used: Binomial theorem and pi Trivia: The story of this episode was co-written by Peter MacNicol (Larry Fleinhardt).
	All's Fair	Julie Hébert	Rob Morrow	March 31, 2006	218
	In an effort to find the murderer of an Iraqi woman, Don enlists the help of the victim's cousin, who lives in Los Angeles. Through her cousin, Don learns information about the woman's disturbing connection to Saddam Hussein, which could lead to her murderer. Meanwhile, Charlie rekindles a romantic relationship when his ex-girlfriend comes to visit. Guest stars: Scott MacDonald and Sonya Walger Mathematics used: Sudoku, logistic regression, game theory Trivia: This episode was directed by Rob Morrow (Don Eppes).
	Dark Matter	Don McGill	Peter Ellis	April 7, 2006	219
	As Don and his team investigate the motive behind two students' deadly school shooting, Charlie uses the school's radio frequency identification system to track the shooters' movements through the school's hallways. When Charlie notices an abnormal pattern, Don and his agents reevaluate the evidence and discover an unlikely third participant. Guest stars: Leighton Meester, Ben Campbell, Jesse Head and Christine Estabrook Mathematics used:
	Guns and Roses	Robert Port	Stephen Gyllenhaal	April 21, 2006	220
	When an ATF agent is found dead amid questionable circumstances, Don demands to take on the case, which revolves around an elaborate bank heist, after he learns the victim is his ex-girlfriend. As the pressure of his job mounts, Don recognizes the impact his professional life has on his personal life and he decides to investigate his flirtation with AUSA Robin Brooks. Guest stars:: Joshua Leonard Mathematics used: Echolocation and biomathematics – DNA sequence alignment
	Rampage	Ken Sanzel	J. Miller Tobin	April 28, 2006	221
	After an unknown man opens fire in the FBI offices, Don and his team must investigate his motive and his connection to a dangerous arms dealer who is on trial. After almost getting shot, Charlie is visibly shaken and reluctant to return to the offices, hindering his contribution in the case. Guest stars: William Charlton, Al Espinosa, Robert O'Reilly and Kevin Carroll Mathematics used: Venn diagram and tesseract/hypercube
	Backscatter	Nicolas Falacci, Cheryl Heuton	Bill Eagles	May 5, 2006	222
	An FBI investigation into a computer hacking scam, which taps into a bank's system to gain access to customer's identities and financial assets, becomes personal for Don when the Russian mob spearheading it comes after him and threatens the safety of Charlie and Alan. Guest stars: Michael Arden and Will Patton Mathematics used: Explicit functions, implicit functions, geometric progression and exponential growth Trivia: Nicolas Falacci has a cameo as one of the Russian mobsters in Charlie's class.
	Undercurrents	J. David Harden	J. Miller Tobin	May 12, 2006	223
	Five young Chinese girls wash up on the shore; while Charlie works out where they came from, it emerges that one of the girls is carrying Avian Flu. Guest stars: Matt Roth, Lauren Velez and Russell Wong Mathematics used: Encoding, vector fields and n-dimensional space Trivia: The boat used by Charlie is named "Monte Carlo". The math technique being used at the time bears resemblances to the Monte Carlo computational algorithms.
	Hot Shot	Barry Schindel	John Behring	May 19, 2006	224
	When two women are found dead with an apparent drug overdose, Don suspects a serial killer. Charlie's help on Don's case is hindered by his bizarre dream about his mother. Guest stars: Kim Strauss, Olympia Dukakis and JoBeth Williams Mathematics used: Directed graph, parabolic equations and probability

See also

• NUMB3RS

External links

• [IMDB Episode Guide]
• [TV.com Episode Guide]

 

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