Buffy, Doctor Who, Star Trek and more have all devoted episodes to members of their supporting cast...
Over an extended run, some television shows give off the impression that all life in their universe revolves around a small number of characters, but if they run long enough, writers and producers will invariably have to look elsewhere every once in a whle. Maybe on another day to every other episode, when the forces of evil rally and all seems lost, the good guys are... otherwise occupied, leaving someone else to pick up the slack.
As a dramatic convention in pop culture, foregrounding minor characters dates at least as far back as Tom Stoppard's 1966 play Rosencrantz & Guildenstern Are Dead, which takes place “in the wings” of Shakespeare's Hamlet as the two minor characters have little comprehension of the tragic events going on concurrently. But over the years, geek