Cher is cheered in 'Mamma Mia! Here We Go Again'

Our critics review “Mamma Mia! Here We Go Again,” the sequel starring Amanda Seyfried, Meryl Streep, and Pierce Brosnan; “The Equalizer 2,” starring Denzel Washington, who’s gone four decades without making a single sequel; “Unfriended: Dark Web,” a thriller about a teen who uses a new laptop to play an online game with friends, but then they all get death threats; “Blindspotting,” about race and class in gentrifying Oakland.