Episode(n.) A separate incident or story in a literary work or series, introduced for the purpose of giving a greater variety to the events related; an incidental narrative, or digression, separable from the main subject, but naturally arising from it.
Thesaurus Entries
action, adventure, affair, anagnorisis, angle, architectonics, architecture, argument, aside, atmosphere, background, broken thread, brokenness, bypath, byway, catastrophe, chapter, characterization, circumstance, color, complication, continuity, contrivance, denouement, departure, design, development, deviation, device, digression, disconnectedness, disconnection, discontinuance, discontinuation, discontinuity, discontinuousness, discreteness, discursion, disjunction, event, excursion, excursus, experience, fable, fact, falling action, fitfulness, gimmick, go, hap, happening, happenstance, incident, incoherence, incompleteness, infix, injection, insert, insertion, insinuation, intercalation, interjection, interlineation, interlocution, intermittence, interpolation, introduction, irregularity, line, local color, matter, matter of fact, mood, motif, movement, mythos, non sequitur, noncontinuance, nonlinearity, nonseriality, nonuniformity, obiter dictum, occasion, occurrence, parenthesis, part, particular, peripeteia, phenomenon, plan, plot, reality, recognition, remark, rising action, scene, scheme, secondary plot, side path, side remark, slant, story, structure, subject, subplot, switch, thematic development, theme, thing, tone, topic, tossing-in, turn of events, twist