sentences: "Knightmare" continued to run on Challenge until 31 March 2007, when the rights to the series expired.By this time only five of the eight series were still being repeated, as the rights to Series 3 expired at the end of 2004, Series 4 on 31 May 2006, and Series 5 on 30 September 2006, the latter two following a final showing of those series.