I was wondering, prompted especially my Bread & Circuses airing on MeTV: were some of the episodes written based not on an original idea, but by the availability of certain sets & costumes. Bread & Circuses, for example, had SOME old style Roman stuff..but also mixed in some modern stuff (like slave shirts being essentially iron-on T-Shirts). Or the gangster planet... Or Spectre of the Gun... I don't think it's necessarily a bad thing, and in fact creative, to share/save costs. We could get some better movies today if studios didn't tear down their stuff right away, but with a bit of lighting & paint, repurpose a set. So how was it done on Star Trek?