Change-Episode-Number
How to Change the Episode/Season Number
If you find that you need to change the order or season number of a series episode, you can do so from Movies->Change Episode/Season Number. Note that this only applies to series entries, not movie entries (i.e. the option is dissabled for movies). A dialog box will appear where you can specify a new episode and/or season number.
The default season and episode number will correspond with the currently selected episode. You can change these values to reassign the episode and/or season number (effectively changing the record's position in the series).
Once you click on OK to apply the change, the record will immediately move to its new position in the series.

