It’s a revival steeped in zombies, crack chemists and alcohol-soaked ad executives. But AMC Networks (AMCX) has clearly played a major role in television’s reformation. The New York-based atelier is responsible for original series “Mad Men,” “Walking Dead” and “Breaking Bad.” Among its new series, “Better Call Saul” is pared from Breaking Bad. Another spin-off, “Fear of the Walking Dead,” is set to premier in the third quarter.