Chris Carter created a cult series with a story that would develop over 9 seasons, which is unprecedented and would only be copied in other series from 2001 onwards (24, Alias...).
Apart from a few episodes, and a weaker season 8 and 9 (loss of focus and disappearance of David Duchovny as a lead actor), this is by far the ultimate TV series of the 90s.
Duchovny and Anderson are great actors.
The only other good series of the 90s is "Millennium - Season 1-3 [DVD] [1996
It's not a coincidence that both the X-Files and Millennium got created by the same genius that is Chris Carter who would then get on creating a spinoff series: "The War Within [DVD
]"The Lone Gunmen: The Complete Series [DVD] [2001