he sixth season of Will & Grace premiered on September 25, 2003 and concluded on April 29, 2004. It consisted of 24 episodes. Due to Debra Messing's pregnancy during the sixth season, Grace did not appear in five episodes: 6.6 "Heart Like a Wheelchair", 6.21 "I Never Cheered for my Father", 6.22 "Speechless", 6.23/6.24 "I Do. Oh, No, You Didn't".

Overview from themoviedb.org