The season finale of Dexter Sunday night set a ratings record for an original series on Showtime as 2.58 million viewers tuned in at 9 00 p.m. and an additional 508,000 for the repeat at 11 00 p.m. It was the first time any Showtime original drew more than 3 million viewers on a single night. It was also the biggest audience for any Showtime telecast since the 1999 Mike Tyson/Orlin Norris fight in Las Vegas that lasted mere seconds. Dexter 's total audience on Sunday represented a 71-percent increase over last season's finale. The strong showing also helped boost viewing numbers for the finale of Showtime Californication , which followed and drew 1.1 million.