Season 1 Cartoon Network , 1999 Watch now Season 2 Cartoon Network , 1999 Watch now Season 3 Cartoon Network , 2001 - 2002 Watch now Season 4 Cartoon Network , 2002 - 2004 Watch now Season 5 Cartoon Network , 2005 - 2007 Watch now Season 6 Cartoon Network , 2008 Watch now