Its approximately seven feet long, and clearly very, very dead.

Its hairless head is tilted back, its mouth agape.

Released in cinemas earlier this year,Prometheuswas a sci-fi adventure movie set in the Alien universe.

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The story behind the making ofPrometheusis remarkably similar.

Guiding them was Ridley Scott, a director with an unwavering eye for technical detail.

His enthusiasm for his work is still evident, and infectious.

He prods a hideous-looking silicone placenta; he probes the grotesque cavity of the deceased Engineer.

He only wanted to fall back to digital effects where he couldnt get what he wanted practically.

That created a real enthusiasm through the whole team.

Sometimes, this behind-the-scenes effort remained largely off-screen.

Id have loved for it to have been an 18-rated film, Scanlan says with a laugh.

The first film was incredibly scary, and there was a lot of suggested horror.

Id have been more than happy to go off the Richter scale.

There does exist, somewhere in the archives, some really quite horrific footage!

If there is indeed a sequel to the prequel, you may see some of that on the screen.

Ridley Scotts exacting design specifications were similarly felt in the costume department.

The space suit and the helmet were the hardest part to get right, Yates told us.

It started off as something very simple, and just grew and grew and grew.

We needed to confirm the actors werent going to suffocate.

Then in the next prototype, Ridley wanted lighting all around the actors face.

So everythings monitored temperature, blood pressure, all of that.

Hes a real stickler for detail.

I want something to sound like this.

I want it to look like that.

No, actually, I want it to look like that.

His eye and ear for detail is uncanny.

All you have to do as an audience is join the dots, Dr Biltoo said.

The Engineers must have been coming back to Earth to check on their experiment.

Thank you, thats a wrap.

Other scenes containing Dr Biltoos alien language were also removed from the final print.

Theyd guessed that the language was Indo-European.

All from that three-second snippet of dialogue, Dr Biltoo told us.

They got the translation so close, I was slightly unnerved.

Unusually, the Blu-ray release has been put together with some of the theatrical versions fan reaction in mind.

Its a candid look at the making of the film, Charles told us.

For me, thats much better than the Oh, hes a genius pop in of documentary.

Its not just fluff.

That, to me, is always interesting.

What are the abandoned ideas?

I love that part of it.

That was great, very enjoyable.

Now, where are we getting dinner?

Where did you park?

And that was it.

We maybe had five minutes of discussion aboutThe Avengers.

WithPrometheus, were still arguing about it months later.

Theres stuff to debate, and thats what makes it a compelling experience.

Prometheusis out now on Blu-ray 3D Collectors Edition, Blu-ray and DVD.