Series Overview
| Season | Episodes | Originally aired | DVD release date | |||
|---|---|---|---|---|---|---|
| Season premiere | Season finale | Region 1 | Region 2 | |||
| 1 | 13 | March 7, 2006 (2006-03-07) | May 16, 2006 (2006-05-16) | September 19, 2006 (2006-09-19) | April 30, 2007 (2007-04-30) | |
| 2 | 23 | September 19, 2006 (2006-09-19) | May 8, 2007 (2007-05-08) | September 25, 2007 (2007-09-25) | October 22, 2007 (2007-10-22) | |
| 3 | 11 | September 25, 2007 (2007-09-25) | December 18, 2007 (2007-12-18) | October 14, 2008 (2008-10-14) | October 20, 2008 (2008-10-20) | |
| 4 | 22 | September 28, 2008 (2008-09-28) | May 10, 2009 (2009-05-10) | September 29, 2009 (2009-09-29) | February 22, 2010 (2010-02-22) | |
Read more about this topic: List Of The Unit Episodes
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“In the order of literature, as in others, there is no act that is not the coronation of an infinite series of causes and the source of an infinite series of effects.”
—Jorge Luis Borges (1899–1986)