Seasons 2-7 represent what the X-Files really is...the overarching storyline about alien abduction and invasion...alien/human hybrids and secret government conspiracies to cover it all up. I was surprised to find out that these episodes (which x-files is really known for) only show up about 4 -6 times a season...the rest are all stand alone episodes about creepy monsters that go on rampages (or whatever else the writers came up with for that week). Sometimes these creepy crawlies show up again, sometimes they don't.
Sometimes X-files is hilarious...classic episodes like the roaches that kill everyone, or fake aliens abducting people but end up getting abducted by real aliens while in the process. Sigh...to watch it all over again...
But the X-files is really about the relationship between Mulder and Scully, and how it grows (or doesn't grow) from season to season culminating in Season 7 (probably the strongest season) when the show really pushes it to the front. Unfortunately, season 8 is probably the worst season...hmph...
If you get the chance and have the time, try watching the whole show in order from start to finish...its really pretty great.
The Truth Is Out There