Friday, July 31, 2015 ratings — New episodes: Dateline NBC, Masters of Illusion, Primetme: What Would You Do? and 20/20. Reruns: Shark Tank, America’s Got Talent, MasterChef, Gotham, Whose Line Is It Anyway?, Elementary, Hawaii Five-0, and Blue Bloods.

Note: If you’re not seeing the updated charts, please try reloading the page or go here.

These are the fast affiliate ratings. The percentages represent the change since the previous original episode. (Percentages aren’t given for reruns or specials.) To see past ratings for a particular show, click the show’s link. The show pages are updated with the daily final ratings when they become available. Those pages include season averages to date.

What were you watching last night? Original network programming, reruns, cable, or something else?