he fifth season of Law & Order: Criminal Intent premiered on NBC on September 25, 2005, and ended on May 14, 2006.
This season featured the series's first two-part episode and "Cruise to Nowhere" was referenced later for an eighth season episode titled "All In".
This season of Law & Order: CI remained in its time slot of NBC Sunday's at 9PM/8c, its final season in this slot on NBC; its move to Tuesdays in the sixth season caused a ratings decline. During the 2005–2006 network TV season episodes were up against episodes of Desperate Housewives on ABC and episodes of Family Guy and American Dad! on Fox. The show "roller coasted" in the ratings with the competition, but NBC executives were impressed with the 11 million viewers per week it was able to retain.Overview from themoviedb.org