Season 1 Discovery , 2003 Watch now Season 2 Discovery , 2004 Watch now Season 3 Discovery , 2005 Watch now Season 4 Discovery , 2006 Watch now Season 5 Discovery , 2008 Watch now Season 6 Discovery , 2009 Watch now Season 7 Discovery , 2010 Watch now Season 8 Discovery , 2011 Watch now Season 9 Discovery , 2012 Watch now Season 10 Discovery , 2013 Watch now Season 11 Discovery , 2014 Watch now Season 12 Discovery , 2014 Watch now Season 13 Discovery , 2015 Watch now Season 14 Discovery , 2015 Watch now Season 15 Discovery , 2016 Watch now Season 16 Discovery , 2016 - 2017 Watch now Season 17 Discovery , 2017 Watch now Season 18 Discovery , 2018 Watch now Season 19 Discovery , 2018 - 2019 Watch now Season 20 Discovery , 2019 Watch now Season 21 Discovery , 2019 Watch now Season 22 Discovery , 2020 Watch now Season 23 Discovery , 2020 - 2021 Watch now Season 24 Discovery , 2021 Watch now Season 25 Discovery , 2022 Season 26 Discovery , 2023 Season 27 Discovery , 2023