According to the “Episode Listing” page on The Infosphere, The Futurama Wiki: https://theinfosphere.org/Episode_Listing.
The films were each broadcast on Comedy Central, and are listed on Disney+ (in season 6), as four parts, which makes 16 ‘episodes’ in total.
If you’re using Disney+, feel free to mark each film as watched after watching the fourth part (Trakt doesn’t have the films split up into four parts anywhere.)
These are not the best episodes, but the ones most important for catching up with the X-Files mythology.
With The X-Files revival, I figure people are going to start watching the series to catch up. It's a long series with a complicated plot, and only some of the episodes are about that plot. So for those wanting to rewatch the show but not sift through the entire series, these are the essential episodes of The X-Files.
The first movie takes place between seasons five and six is and important. The second movie takes place after the series.
