Dave Grohl 'speechless' when horror legend agreed to 'Studio 666' cameo (exclusive)

Watch: Dave Grohl discusses John Carpenter's Studio 666 cameo

Dave Grohl confessed he was left "speechless" when horror legend John Carpenter agreed to make a cameo appearance in Foo Fighters slasher movie Studio 666.

The Halloween director pops up for a brief appearance in the film, and also composed a theme song for the blood-soaked tale, in which the Foos portray versions of themselves.

Grohl told Yahoo Entertainment UK that Carpenter's involvement was "entirely a coincidence" and came about because of a Kevin Bacon-esque trail of connections.

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"The guy that does our lights on tour, Dan Hadley, also does lights for John Carpenter when John goes out and performs his music for live audiences," said Grohl.

He added: "So when Dan found out we were making a horror film, he was like 'dude, I know John Carpenter, you should email him and see if he'll make a cameo'.

"I thought there was no f***ing way John Carpenter would be in our s****y horror movie. But I emailed him and said: 'Hi, my name's Dave. I'm in a band called Foo Fighters. We have a mutual friend and we're making a horror film. If you... want to... make a cameo... please?'

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"I guess we took his kid's band on the road 15 years ago and he emailed back to say that he would return the favour by not only making a cameo in the film, but also writing the theme music.

"For once, I was speechless. You couldn't ask for a greater honour or blessing for a f***ing horror film that you make with your friends. It's kind of too good to be true."

Based on a story penned by Grohl, the movie sees the band travel to a California home with a dark past in order to provide some atmosphere for their 10th album.

Naturally, things go pear-shaped once they get there, with Grohl suffering from writer's block until he heads down to the basement and seemingly discovers something malevolent.

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Blood starts flying very quickly, with director B. J. McDonnell delivering gore-soaked set pieces involving chainsaws, electrocution and a flying set of cymbals.

With art echoing reality, the house in Encino, California was the actual recording location for the Foos' real-world tenth release Medicine at Midnight.

"While we were in the house, I'm like: 'Wait a second, we're in a creepy house. We might as well just finish the record, get a bunch of cameras and make some low-budget, lo-fi, old school slasher film'," said Grohl.

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He added: "It was never our intention to be sitting here talking about a f***ing horror movie that's in theatres all over the world.

"But it just happened. That's very Foo Fighters-esque. It starts with an idea like this and then... snowball."

Studio 666 will be released exclusively in cinemas on 25 February.

Watch: Trailer for Studio 666