| Season
|
Episodes
|
Originally aired (U.S. dates)
|
| Season premiere
|
Season finale
|
|
|
1
|
21
|
October 12, 2007
|
August 31, 2008
|
|
|
2
|
30
|
September 12, 2008
|
August 21, 2009
|
|
|
Film
|
August 28, 2009
|
|
|
3
|
28
|
October 9, 2009
|
October 15, 2010
|
|
|
4
|
27
|
November 12, 2010
|
January 6, 2012
|
