public void AddEpisode([NotNull] Episode e)
{
Season airedSeason = GetOrAddAiredSeason(e.AiredSeasonNumber, e.SeasonId);
airedSeason.AddUpdateEpisode(e);
Season dvdSeason = GetOrAddDvdSeason(e.DvdSeasonNumber, e.SeasonId);
dvdSeason.AddUpdateEpisode(e);
}