Season 1 Discovery , 2003 Watch now Season 2 Discovery , 2004 Watch now Season 3 Discovery , 2005 - 2006 Watch now Season 4 Discovery , 2006 Watch now Season 5 Discovery , 2006 Watch now Season 6 Science , 2007 Season 7 Science , 2009 Season 8 Science , 2010 Season 9 Science , 2011