Season 1 Discovery , 2002 - 2003 Watch now Season 2 Discovery , 2004 Watch now Season 3 Discovery , 2005 Watch now Season 4 Discovery , 2006 - 2007 Watch now Season 5 Discovery , 2008 Watch now Season 6 Discovery , 2009 - 2014 Watch now Season 7 Discovery , 2018 Watch now Season 8 Discovery , 2019 - 2020 Watch now