# Numbers season 6

The sixth and final season of Numbers, an American television series, first aired on September 25, 2009 and ended on March 12, 2010, on CBS. This season featured only 16 episodes.
On May 18, 2010, CBS canceled the series.

## Cast

* Rob Morrow as Don Eppes
* David Krumholtz as Charlie Eppes
* Judd Hirsch as Alan Eppes
* Alimi Ballard as David Sinclair
* Peter MacNicol as Larry Fleinhardt
* Navi Rawat as Amita Ramanujan
* Dylan Bruno as Colby Granger
* Aya Sumika as Liz Warner
* Sophina Brown as Nikki Betancourt

## Episodes

| No. overall | No. in season | Title | Directed by | Written by | Original air date | Prod. code | US viewers (millions) |
| 103 | 1 | "Hangman" | Ken Sanzel | Ken Sanzel | September 25, 2009 (2009-09-25) | 601 | 8.10 |
| While Charlie waits for an answer to the question he popped to Amita, Don and his team try to hunt down a sniper (Gary Cole) intent on killing an activist (David Call) under FBI protection. Mathematics used: Unexpected hanging paradox and Barberpole illusion ||||||||
| 104 | 2 | "Friendly Fire" | Rod Holcomb | Mark Llewellyn & Robert David Port | October 2, 2009 (2009-10-02) | 602 | 7.85 |
| Two members of a unit led by Don's former mentor (Gregg Henry) are killed during a shootout with bank robbers. The bank robbers refuse to take responsibility for the killings and Charlie recreates the shootout to find out how they died, while Don must face up to the fact that his former mentor may be dirty. Lakers basketball player Jordan Farmar returns in another cameo performance. Mathematics used: Triangulation ||||||||
| 105 | 3 | "7 Men Out" | Alex Zakrzewski | Don McGill | October 9, 2009 (2009-10-09) | 603 | 7.34 |
| To find the person behind a deadly gambling ring that is running a high-stakes Russian roulette tournament, Don and his team are called in to investigate. Elsewhere, Don and Charlie become concerned over Alan's financial health. Sarah Rafferty, Tim Guinee and Jason Antoon guest star. Mathematics used: IP traceback ||||||||
| 106 | 4 | "Where Credit's Due" | Dennis Smith | Andy Dettmann | October 16, 2009 (2009-10-16) | 604 | 7.77 |
| The team investigates several deaths that turn out to be copies of a soon-to-be-released movie, while Larry goes on his own personal adventure. Alan continues his job search. Adam Goldberg, Jessica Lundy and Tyler Francavilla guest star. Mathematics used: Triangulation ||||||||
| 107 | 5 | "Hydra" | Ralph Hemecker | Sean Crouch | October 23, 2009 (2009-10-23) | 605 | 8.05 |
| The team attempts to find the daughter (Emily Skinner) of a geneticist (Christian Camargo) whom they suspect was kidnapped by the unstable mother. However, they become concerned about the case when they find evidence that suggests the young girl was a clone. Meanwhile, Charlie and Amita discuss having kids and Liz reveals a dark secret. Keith David, Tony Hale and Mia Barron also guest star. Mathematics used: Wavelets, Acoustics and Cake cutting ||||||||
| 108 | 6 | "Dreamland" | Stephen Gyllenhaal | Nicolas Falacci & Cheryl Heuton | October 30, 2009 (2009-10-30) | 606 | 7.74 |
| A woman's corpse turns up at a decommissioned air base. John Michael Higgins and John Cariani guest star. Mathematics used: Electric Fields for Three Point Charges, Cyclotrons and Gaussian Laser Modes ||||||||
| 109 | 7 | "Shadow Markets" | Julie Hébert | Julie Hébert | November 6, 2009 (2009-11-06) | 607 | 8.09 |
| In order to find a cyber crime lord, the team conducts an undercover sting. The operation is prevented by a brilliant hacker (Josh Cooke) whose goal is to take over the Internet black market. However, his actions put him in a dangerous online war that might lead to murder. Pablo Schreiber, Wendy Makkena and Caroline Lagerfelt also guest star. ||||||||
| 110 | 8 | "Ultimatum" | Dennis Smith | Robert David Port | November 13, 2009 (2009-11-13) | 608 | 8.16 |
| In the middle of a case where he is tracking down a criminal in charge of a heroin ring inside a prison, Agent Ian Edgerton (Lou Diamond Phillips, in a recurring role) unexpectedly turns into the murder suspect when the informant he meets with winds up dead, sending Edgerton over the edge when he takes a member of Don's team hostage. Christopher McDonald and Missi Pyle guest star. Mathematics used: Pursuit-evasion, Game theory and Ultimatum game ||||||||
| 111 | 9 | "Con Job" | Ralph Hemecker | Don McGill | November 20, 2009 (2009-11-20) | 609 | 7.84 |
| When robbers hit a diamond exchange and take hostages, Don and the team find an unlikely ally in convict John Buckley (Fisher Stevens), who may help the team's investigation when they believe the men are copying Buckley's criminal strategies. Jon David Casey and Ellen Hollman guest star. Mathematics used: Packet injection, Man-in-the-middle attack and Combinatorial game theory (on hare games) ||||||||
| 112 | 10 | "Old Soldiers" | Ken Sanzel | Steve Cohen | December 4, 2009 (2009-12-04) | 610 | 7.38 |
| Agent Roger Bloom (Henry Winkler), who worked on the Cooper case, is brought in to help the team when they foil a robbery of an armored car full of Federal Reserve money and recover bills that trace back to the infamous D.B. Cooper heist. Michael Hogan and Rick Ravanello also guest star. Mathematics used: Probabilistic risk assessment ||||||||
| 113 | 11 | "Scratch" | Stephen Gyllenhaal | Mary Leah Sutton | January 8, 2010 (2010-01-08) | 611 | 9.32 |
| The team investigates the theft of scratch-off lottery tickets, but the stakes are raised when one of the culprits killed at a botched robbery turns out to be a former lottery winner. Guest stars include Michael O'Neill, Nicole Sullivan and Allison Smith. ||||||||
| 114 | 12 | "Arm in Arms" | Gwyneth Horder-Payton | Andy Dettmann | January 15, 2010 (2010-01-15) | 612 | 9.65 |
| The team searches for a lost shipment of high-caliber firearms when one of the weapons is responsible for random killings throughout the city. Also, Charlie and Amita disagree on a wedding date while Don re-evaluates his relationship with Robin (Michelle Nolden). James Remar, Jon Seda and John Cariani guest star. Mathematics used: Reverse trajectory, 4D mapping, Combinatorial optimization and Pigeonhole principle ||||||||
| 115 | 13 | "Devil Girl" | Stephen Gyllenhaal | Julie Hébert | January 29, 2010 (2010-01-29) | 613 | 8.70 |
| The team searches for a serial killer who is targeting men that solicit prostitutes. Also, Colby and Nikki deal with the aftermath of a car crash when they have an accident during the investigation. Tony Hale, Clea DuVall and Jeff Roop guest star. Mathematics used: Geo-profiling and Scaled gradient projection ||||||||
| 116 | 14 | "And the Winner Is…" | Ralph Hemecker | Gary Rieck | February 5, 2010 (2010-02-05) | 614 | 9.18 |
| The team gets a taste of the limelight when they search for jewels worth millions that have been stolen during an awards show broadcast. In addition, Don revisits an old case that is haunting him, and Larry (Peter MacNicol) returns from his adventure in the desert. Guest stars include Marilu Henner, William Katt, Rowena King, Rick Hoffman and Stephen Spinella. Mathematics used: Retrograde analysis and Crowd flux dynamics ||||||||
| 117 | 15 | "Growin' Up" | Rob Morrow | Robert Port | March 5, 2010 (2010-03-05) | 615 | 8.10 |
| The team investigates the deaths of two men who were part of a group of friends that had been sexually assaulted by a teacher when they were young boys. Jon Bernthal, Moira Kelly, Alan Ruck and Wendy Makkena are among the guest stars. ||||||||
| 118 | 16 | "Cause and Effect" | Nicolas Falacci | Nicolas Falacci & Cheryl Heuton | March 12, 2010 (2010-03-12) | 616 | 8.74 |
| The team try to find Don's stolen gun, which is being used in a series of vigilante killings. Meanwhile, Charlie and Amita get married and Don decides on the direction he wants to take in life. Vyto Ruginis guest stars; Michelle Nolden, Lou Diamond Phillips, John Cariani and Matthew Yang King make final appearances in their recurring roles. ||||||||