Thirty years ago ‘The Simpsons’ debuted on ‘The Tracey Ullman Show.’ To celebrate this milestone, we listen back to Terry’s interviews with creator Matt Groening, Nancy Cartwright (Bart), Julie Kavner (Marge), Hank Azaria (Homer and others), producers and writers Al Jean and Mike Reiss, and composer Alf Clausen. Also, film critic David Edelstein reviews ‘Alien: Covenant.’