The first, and I suspect this is the biggie, is the setting.

But westerns are not box office gold, and are an extremely tough sell.

Bluntly, most people dont want to watch them.

Especially in a big summer blockbuster.

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Im not deliberately swimming against the tide on this one, nor trying to antagonise.

But the above two reasons?

Theyre among the main reasons why I thinkPart IIIeclipsesPart II.

), and that it bothers to evolve the character of the Doc.

And I love that it also provides as deeply satisfying a round-up to a trilogy as I can remember.

And there are plenty more reasons to commend it than just those.

But check out the extras in the Hill Valley saloon.

Work your way through enough westerns, and there are some familiar faces sat there, drinking away.

In fact, its a slightly layered cheat.

An empty cave, by the looks of it, with no creature inside and nothing disturbed.

However, whats this?

A leaking fuel line?

Enter, then, a bloody big bear.

You see it, subtlely, in the dialogue.

Great Scott, utters Marty at one point.

This is heavy, replies the Doc, each saying dialogue were used to hearing from the other.

Its one of many indicators that our two lead characters are fulfilling slightly different functions here.

This all alters the film in another pivotal way, too.

But with his head turned, he cant fulfil that role here.

Enter, then, Seamus McFly, played once more by Michael J Fox.

Its a small role that fulfils a necessary narrative function.

Namely, that it highlights lighting differences when Fox has to act against himself.

Marty is lit in a slightly different way, and I found you could really tell.

However, I cant remember seeing it in any film before this one.

Id argue the roots of his thinking are right here, though.

Its structure is certainly the same.

Yet, it builds plenty onto those foundations.

Here, hes having a blast.

The production design is terrific once more, too, and Alan Silvestri delivers yet another superb musical score.

Also, Id argue, the end set piece is the best that the trilogy delivers.

Its casually introduced, when Marty is driving the time machine towards the drive-in movie screen in 1955.

We finally see Marty avoid his accident, for instance, changing his life forever.

Just thought youd like to know that, if you didnt already.

As a standalone film, its strong.

As the end part of a trilogy?

Its hard to think how it could have been better.

A real treat, and a very rewatchable one, too.

The Back To The Future trilogy arrives on Blu-ray on 25th October.