The Italian adventurer and libertine Giovanni Jacopo Casanova lived from 1725 to 1798, but in this six-part series Dennis Potter attempted to find a contemporary relevance through his central themes of sex and religion. He commented that Casanova "was concerned with religious and sexual freedom, and these are the things we have to address ourselves to now." Casanova was imprisoned in Venice in 1755, and Potter used that event as a central device, constantly inter-cutting to contrast Casanova's amorous escapades, radiant, joyful and brightly lit, with his oppressive solitary confinement in the gloom of a half-darkened cell.

Babylon 5 is a five-mile long space station located in neutral space. Built by the Earth Alliance in the 2250s, its goal is to maintain peace among the various alien races by providing a sanctuary where grievances and negotiations can be worked out among duly appointed ambassadors. A council made up of representatives from the five major space-faring civilizations - the Earth Alliance, Minbari Federation, Centauri Republic, Narn Regime, and Vorlon Empire - work with the League of Non-Aligned Worlds to keep interstellar relations under control. Aside from its diplomatic function, Babylon 5 also serves as a military post for Earth and a port of call for travelers, traders, businessmen, criminals, and Rangers.