Season 1 Cartoon Network , 2004 Watch now Season 2 Cartoon Network , 2004 - 2005 Watch now Season 3 Cartoon Network , 2005 - 2006 Watch now Season 4 Cartoon Network , 2005 - 2006 Watch now Season 5 Cartoon Network , 2007 - 2008 Watch now Season 6 Cartoon Network , 2008 - 2009 Watch now