As indicate in this previous content report, this episode was originally broadcasted as a special episode.

This report isn't updated. They fixed that information. (as they fixed a bunch of wrong writing credits too). Just look https://www.bbc.co.uk/programmes/b006q2x0/episodes/guide

At the time of airing, and even 5 years after airing, The Snowmen was not part of any series. It was retroactively added to Series 7 sometime between June 24 and July 28, 2018.

So, just for my understanding and don't give unnecessary work for the mods. If the official BBC change something, it shouldn't reflex here? And also, if the production lists as part of a season, like in the production sheet, (just a example of a Christmas special as part of season 4) https://www.yourprops.com/End-of-Time-2-Script-original-production-material-Doctor-Who-TV-2005-YP833935.html, shouldn't we? What we're considering here? And also in every official list, BBC, BBC iPlayer, Bluray releases, this episodes are listed after some episodes and before others. We don't consider that? Because Doctor Who has a tradition of Christmas themed episodes, but they are listed in between seasons, different from another Specials listed here like children in need, minisodes (with the exception of The Night of The Doctor). So resuming, what are our basis here? Because putting this episodes not in between seasons, doesn't make any sense, and I didn't find any official BBC or production sheet listed as we list here.

@ycarogabriel said:

If the official BBC change something, it shouldn't reflex here?

We follow the original broadcast. Every changes done later shouldn't be taken in account.

And also, if the production lists as part of a season, like in the production sheet, (just a example of a Christmas special as part of season 4) https://www.yourprops.com/End-of-Time-2-Script-original-production-material-Doctor-Who-TV-2005-YP833935.html, shouldn't we? What we're considering here? And also in every official list, BBC, BBC iPlayer, Bluray releases, this episodes are listed after some episodes and before others. We don't consider that?

If an episodes list is available on the official site at the time of the original broadcast, we should always follow it.

Note : iPlayer isn't an official source, as it doesn't always follow the original broadcast. The same apply to DVD and/or BluRay.

Because Doctor Who has a tradition of Christmas themed episodes, but they are listed in between seasons, different from another Specials listed here like children in need, minisodes (with the exception of The Night of The Doctor). So resuming, what are our basis here? Because putting this episodes not in between seasons, doesn't make any sense, and I didn't find any official BBC or production sheet listed as we list here.

Episodes listed between seasons should always be listed in the specials season.

Understood. Sorry for the unnecessary reports. But about the BBC iPlayer, with the advent of Whoniverse, they consider the “official status” of the show. https://www.bbc.com/mediacentre/2023/doctor-who-the-whoniverse-tales-of-the-tardis Of course, if we're considering broadcast, it has no relevance. And I know isn't the point here and isn't in discussion, but in the streaming era we live, broadcast really should have that relevance? It's just a thought that maybe TMDB should evolve for the sake of the viewer.

The first official release is the KING.

But considering that the first official release didn't count that people would watch it later (maybe in home video with an actual work to maintain consistence), should be king? Information has a function and a form, and the form of TV broadcast fits well with the form of digital? For which function? And that's the thing, for the broadcast, which you have no choice of watching in different order, you watch the original release or reprise, a season definition for special episode has no use, but we're not watching a TV broadcast.