THE terrifying story of missing Huddersfield backpacker Peter Falconio has been turned into a new slasher movie.
Wolf Creek is reportedly so grisly that some members of a test audience walked out.
The forthcoming release of the low budget film has angered Vincent James, stepfather of Peter's girlfriend Joanne Lees.
Speaking from his home in Almondbury, he said: "This is not on at all.
"It's very upsetting and shouldn't be turned into entertainment like this."
First-time Australian director Greg Mclean has merged parts of the Falconio tragedy with the story of backpacker serial killer Ivan Milat.
The bodies of Milat's seven victims were found in shallow graves in a forest near Sydney between 1992 and 1993.
The film follows three backpackers through remote Western Australia when their car breaks down.
They encounter a seemingly friendly stranger played by John Jarratt, who appeared in cult classic Picnic at Hanging Rock.
He offers to tow them back to his camp - but things go wrong immediately when he pulls a giant knife.
Early reviewers say eyes are popped, limbs are cut off and spines are severed.
Peter Falconio, from Hepworth, disappeared in July, 2001 while on a road trip through the Outback with his girlfriend.
Milat's crimes were some of the most shocking seen in Australia
Director Mclean said: "There seemed to be such a glaring opportunity for a horror film set in the Outback.
"I created the story for this film by merging those two stories."
Melbourne-based Mclean is celebrating after the film, which cost less than £1m to make, was selected for competition at the Sundance Film Festival, a prestigious showcase for independent films founded by film legend Robert Redford.
Wolf Creek will have its world premiere in January at the Utah festival under Sundance's new World Cinema Competition category.
Mclean claims two people fainted and four walked out at a test screening.
"It is incredibly realistic, which I think is what disturbs people," he said.