NBC topped the broadcast ratings Monday in primetime with two series premieres and its drama kingpin This Is Us. The network’s night started with the Dwayne Johnson family comedy Young Rock, which debuted strong with a 0.9 in the adults 18-49 demographic and 5.03 million viewers tuning in to smell what The Rock was cooking. Saturday Night Live staple Kenan Thompson followed with the debut of his new comedy Kenan (0.8, 4.07M).