Warner Bros. has released a free to watch Batman Dark Knight doc with behind-the-scenes footage of Heath Ledger

It may have been 12 years since Christopher Nolan's trilogy of Batman movies concluded but they still have fans coming back time and time again.

Excellent movies (opinions may vary on the third one) with a top-notch director and a stellar cast all add up for a great experience.

If you've seen the films enough to recite the scripts from memory then you'll probably have a decent idea behind how they were made, but wouldn't it be nice to have all of that gathered in one place together along with stuff you've never even seen before?

You probably know all about the deleted scenes, what the actors went through and could pick out all of the references to the Batman comics by memory.

If so then you're in luck, as there's a whole Warner Bros. documentary for Batman fans to enjoy which delves into production of the movies and features exclusive interviews with the likes of Guillermo Del Toro and Zack Snyder about what the movies mean.

Warner Bros.

The full title is The Fire Rises: The Creation and Impact of the Dark Knight Trilogy, but that's a bit of a mouthful, so you'll understand if we don't keep referring to it as that.

What you get is 76 minutes of utterly fascinating behind-the-scenes glimpses into how they made Batman Begins, The Dark Knight and The Dark Knight Rises.

There's clips of some of the auditions for Bruce Wayne, including the performance that got Christian Bale the role.

You can learn about the ideas that were poured into the trilogy of films which made certain moments stick in the minds of you, the audience.

And, of course, you can see plenty of the development of Heath Ledger's legendary performance as The Joker.

Warner Bros.

Nolan said in the documentary that he and Ledger 'absolutely saw eye to eye on the bigger picture of who this guy was gonna be' when discussing the role of The Joker.

The director revealed that they ran through a series of inspirations and 'Heath was ready to do it', ultimately winning an Oscar for his performance.

During his screen test for The Dark Knight, Ledger asked to be able to apply his own makeup as that's what The Joker would actually have done, and you've likely heard of the other things he did to really get into character.

If that sounds good then we have some extra special news for you, it's entirely free to watch.

Seriously, the entire thing is free to view on YouTube here and nothing beyond a good internet connection is stopping you from spending a merry hour-and-a-bit diving headfirst into how they made The Dark Knight Trilogy.