- | 25 Episodes

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Season 1

2005 | 13 Episodes

Season 1 of Numb3rs premiered on January 23, 2005.

Season 2

2005 | 24 Episodes

Season 2 of Numb3rs premiered on September 23, 2005.

Season two has several changes to Don's FBI team: Terry Lake is reassigned to Washington and two new members join Don and David Sinclair: Megan Reeves and Colby Granger. Charlie is challenged on one of his long-standing mathematical workpieces and starts work on a new theory, cognitive emergence theory.

Season 3

2006 | 24 Episodes

Season 3 of Numb3rs premiered on September 22, 2006.

Charlie and Amita intensify their relationship, as do Larry and Megan, especially after Megan's kidnapping. Amita has trouble adjusting to her new role as a CalSci professor, and Larry announces his leave of absence; he will be on the International Space Station for six months, which greatly distresses Charlie.

Season 4

2007 | 18 Episodes

Season 4 of Numb3rs premiered on September 28, 2007.

Season 5

2008 | 23 Episodes

Season 5 of Numb3rs premiered on October 3, 2008.

Season 6

2009 | 16 Episodes

Season 6 of Numb3rs premiered on September 25, 2009.