Numbers

Don Eppes, the lead FBI agent and brother to Charlie Eppes. Played by Rob Morrow

Professor Charlie Eppes, a 'Cal-Sci' (based on Caltech) professor and mathematical genius helping the FBI solve crimes. Played by David Krumholtz

Alan Eppes, father of Charlie and Don. Played by Judd Hirsch

Professor Larry Fleinhardt, played by Peter MacNicol

Dr. Amita Ramanujan, played by Navi Rawat

FBI Agent Megan Reeves, played by Diane Farr (Season 2+)

FBI Agent David Sinclair, played by Alimi Ballard

FBI Agent Colby Granger, played by Dylan Bruno (Season 2+)

Season 1

Title Writer(s) Director(s) Original Airdate #

Pilot Nicolas Falacci, Cheryl Heuton Davis Guggenheim, Mick Jackson January 23, 2005 101

Charlie assists Don on a serial rapist case by calculating a "hot zone", an area where the rapist is most likely to live. Don is removed from the case after Charlie's formula fails to turn up any leads.
Guest stars: Anthony Heald and William O'Leary
Mathematics used: 11-dimensional supergravity theory, probability and projectile motion

Uncertainty Principle Jeff Vlaming David Von Ancken January 28, 2005 102

Charlie successfully predicts the time and place of a bank robbery using what he says are elements of Heisenberg's uncertainty principle (he's really talking about the observer effect), but when the planned arrest goes bad, he retreats into the math problem P vs. NP.
Guest stars: Alan Davidson and Robinne Lee
Mathematics used: P vs. NP and Heisenberg's uncertainty principle

Vector Jeff Vlaming David Von Ancken February 4, 2005 103

A deadly strain of influenza is spreading through Los Angeles. Don investigates whether the strain was released deliberately, and Charlie tries to calculate the origin and likely spread of the virus.
Guest stars: CCH Pounder, J.K. Simmons and Rainn Wilson
Mathematics used: Patient Zero

Structural Corruption Liz Friedman Tim Matheson February 11, 2005 104

An engineering student commits suicide, but Charlie suspects foul play. Don disagrees, but he agrees to help Charlie investigate whether the student was murdered because of his research into a building's structural integrity.
Guest stars: Douglas Sills and Devon Michaels
Mathematics used: Pendulum and Foucault pendulum

Prime Suspect Doris Egan Lesli Linka Glatter February 18, 2005 105

A young girl is kidnapped, but her parents refuse to cooperate with Don's investigation. The girl's father is a mathematician, and the kidnapping may be related to his work on the Riemann hypothesis.
Guest stars: Neil Patrick Harris and Susan Egan
Mathematics used: Cryptography, prime numbers, Riemann hypothesis and Riemann zeta function

Sabotage Liz Friedman Lou Antonio February 25, 2005 106

Don is investigating a series of train accidents which are recreations of previous wrecks. The saboteur leaves a note composed entirely of numbers.
Guest stars: Bobby Preston, Jeffrey D. Sams, Keith Szarabajka, Sam Ayers and Benjamin Salisbury
Mathematics used: Fibonacci sequence, golden ratio and Beale ciphers

Counterfeit Reality Andrew Dettman Alex Zakrzewski March 11, 2005 107

A strange series of robberies leads Don into a case involving counterfeit money, kidnapping and murder. Don is aided by Secret Service agent Kim Hall while Charlie uses maths to analyse fake bank notes and track their spread.
Guest stars: Sarah Wayne Callies, Mel Winkler and Melanie Lora
Mathematics used: Guilloché pattern and wavelet analysis

Identity Crisis Wendy West Martha Mitchell April 1, 2005 108

A new case with distubing similarities to an old case leads Don to question whether he put the right man in jail. While Don tries to find the connection between the two cases, he asks Charlie to look for mistakes or flaws in the first case.
Guest stars: Molly Hagan
Mathematics used: Poker, geometric progression - paper folding, pyramid scheme, fingerprint and Schrödinger's cat

Sniper Zero Ken Sanzel J. Miller Tobin April 15, 2005 109

Don is investigating a series of sniper killings, and Charlie is searching for an underlying pattern to the attacks. What appears to be bad data can't be eliminated from the analysis, because it fits the only pattern he can find.
Guest stars: Lou Diamond Phillips and Heather Lee
Mathematics used: Tipping Point, regression toward the mean and exponential growth

Dirty Bomb Andrew Dettman Paris Barclay April 22, 2005 110

A truck carrying radioactive waste disappears, and Don fears that a dirty bomb will be set off in downtown Los Angeles.
Guest stars: David Marshall Grant and Carrie Preston
Mathematics used: Game theory - prisoner's dilemma

Sacrifice Ken Sanzel Paul Holahan May 6, 2005 111

A researcher is murdered in his home, and Charlie must reconstruct data erased from his computer while Don investigates possible suspects. The most important lost data concerns baseball statistics and Sabermetrics, which is an unlikely motive for murder.
Guest stars: Joseph Gordon-Levitt, Stacy Edwards and Bruce Davison
Mathematics used: Sabermetrics

Noisy Edge Nicolas Falacci, Cheryl Heuton J. Miller Tobin April 29, 2005 112

An unidentified flying object travels over Los Angeles and then disappears. Don suspects terrorist activity, and Charlie tries to find out more about the object and its flight path by analyzing radar and weather satellite data.
Guest stars: Ethan Embry, Gloria Reuben, Bill Smitrovich and Castulo Guerra
Mathematics used: Combinatorics and conditional probability distribution - "squish-squash" with Fourier analysis

Man Hunt Andrew Dettman Martha Mitchell May 13, 2005 113

A prison bus crashes, allowing two dangerous convicts to escape. Don is joined by his former partner from Fugitive Recovery as the Bureau launches an effort to recapture them.
Guest stars: Jennifer Westfeldt, Eddie Velez and Christina Cox
Mathematics used: Bayesian inference, Markov chain, Chapman-Kolmogorov equation and Monty Hall problem

Season 2

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

Season 3 Starts US on 22 September 2006.

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