In my view, Aristotle misconstrues what epic is trying to do. The episodes aren’t a distraction, they’re the whole point. The overarching story provides a narrative and thematic frame for the episodes, allowing multiple stories to come together into a larger, cohesive whole. The frame narrative is necessarily sparse and even boring, as Aristotle’s famous reductive summary of the Odyssey illustrates, but it’s necessary to keep the episodes from being purely episodic, arbitrarily juxtaposed narrative fragments.
At its best, binge-watchable serial drama is trying to be an epic. Within each season, we have an overarching plot that makes room for several narratively and thematically related episodes. The story of Don Draper’s secret identity gives us a window into the worlds of Peggy and all the other beloved supporting cast, just as Tony Soprano’s quest to become the undisputed boss opens up a narrative world full of fascinating characters.
I’ve written before about Main Character Syndrome, the phenomenon of viewers becoming bored and even resentful of the main character of the framing narrative, and I believe that the fundamentally epic structure of binge-watchable serial drama explains why that is such a constant pitfall. It’s a difficult balance to keep the framing narrative thin enough to allow for rich episodic side-trips but compelling enough that you don’t get impatient with it. Arguably even Homer fails on this point — once it comes time to settle accounts with the primary story of Odysseus coming home to claim what’s his (the beginning of book 13), it feels like all the air has been sucked out of the room.
The balance is easier to strike within a single season, as the Mad Men and Sopranos examples make clear.