As the best TV grows in consistency, depth, and prestige, it’s a familiar leap to apply the metaphor of literature to the most acclaimed shows. Collected as DVD box sets, scripted TV series line shelves like fat Victorian novels. So it’s time for the next step: What should last? Which TV series belong in our canon, elevated to an honored position like the “Great Books” of the past? AMC’s “Breaking Bad,” which returns Sunday night for the first half of its final 16-episode season, is among them.
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