The main episodes list should be order by the original airdates.

You can use this episode group if you want them in the intended order.

How do we name the files if we want them to show up in the intended order? Like instead of Firefly.S01E11 is it something like Firefly.Intended.S01E01, or Firefly.S01E01.Intended? Then it would show up as the first one to watch. That would be helpful instead of having to reference that episode group after you finish an episode.

@mathyou said:

How do we name the files if we want them to show up in the intended order? Like instead of Firefly.S01E11 is it something like Firefly.Intended.S01E01, or Firefly.S01E01.Intended? Then it would show up as the first one to watch. That would be helpful instead of having to reference that episode group after you finish an episode.

The Kodi manual is here.