I'm wondering if there's any Star Trek episode which could have been set in any pretty much any other (non-futuristic) setting without modification, even if the appearance of the technology is incidental.
For the purpose of this question I'm going to assume that the following are roughly achievable with today's technology:
- communicators (in a vicinity of a planet/ship)
- natural language processing and database querying
And that the mere appearance of an alien or android doesn't disqualify the episode unless extraordinary non-human capabilities/characteristics of that being are portrayed. Cultural differences are okay because they are story elements, not technology.
Examples of things that automatically disqualify:
- impulse drive and warp drive
- time travel
- replicators, transporters, phasers
Is there any episode where we do not see advanced technology or alien traits?