Express.co.uk published the image after being sent it by Ray Santilli, the British music producer behind a hoax “alien autopsy” video that fooled the world in 1995.
Thousands of alien truth seekers believed Mr Santilli had obtained genuine US military footage of the infamous incident, allegedly involving a crashed UFO and alien bodies, said to have happened outside the New Mexico town in July 1947.
To their disappointment, the film was later exposed as being staged using actors.
The hoax was back in the spotlight last week after Spyros Melaris, who was hired by Mr Santilli and film producer Gary Shoefield to make the black and white film, told the story of his involvement in a one-man West End show.
However, Mr Santilli hit back saying the hoax was a “recreation” of genuine 1947 footage that he obtained before the fake was made, but was of too poor quality to be screened.
He provided Express.co.uk with a grainy still from what he said was the original, in a bid to prove he is telling the truth.
The image, which we published, appears to show a form, possibly an alien, lying down.
However, debunkers have already seized upon it as “just another hoax”.
Scott Brando runs Ufoofinterest.org and forensically examines UFO and alien images and video to see if he can work out what they actually are.
He tweeted Express.co.uk saying the image Mr Santilli provided us looked like a negative of a still from the 1995 hoaxed alien autopsy video.
He compared it to a still from the 1995 film, and said it looked like it had been scuffed to look older.
Alejandro Rojas, host of Open Minds Radio, said of Mr Brando’s observations: ” He provided the image below, and it does look spot on.
“Mr Santilli claims he may release the entire film at some point in the future, but I would guess it would need to involve a lot of money and that it will be inconclusive in the end.”
Andre Milne, founder of defence technology firm Unicorn who is an avid UFO researcher, also contacted Express.co.uk about the “new 1947 image”.
He said: “I ran a forensic comparison of this image against the autopsy ‘hoax’ film.
“It is a nothing but an after effect negative of a screen shot taken from the autopsy ‘hoax’ film itself.”
We contacted Mr Santilli saying it was suggested the still was just a negative of a still from the 1995 hoax.
On email, he simply replied: “1947”.
When asked if he was maintaining it was a still from 1947 original footage, and not a negative from the 1995 remake, he said: “I am driving.”
His 1995 release showed men in white coats apparently dissecting an alien, leaving UFO hunters convinced it was the smoking gun evidence they were looking for of the Roswell incident.
Truthers have been searching for proof since it was first claimed aliens crashed a flying saucer in the New Mexico desert near Roswell in July 1947.
They say the US government then covered up the evidence by storing the flying saucer and dead bodies in a secret military base.
It remains one of the world’s biggest conspiracy theories but, to the disappointment of alien hunters, the 1995 footage was later branded an elaborate hoax.
Mr Santilli said the original footage came to light in 1992 when he was asked by Polygram, now Universal, to do a comprehensive documentary about Elvis Presley.
He said: “During the trip a cameraman in Cleveland asked if we were interested in anything else.
“At the time we had no knowledge of Roswell or aliens, but he claimed he was the cameraman working for the army airforce and explained the whole alien autopsy story.”
Mr Santilli contacted Express.co.uk after we reported on how Mr Melaris revealed in his show how the video was produced inside a north London flat, thousands of miles from the secret US base it was purporting to be in.
After seeing the “1947 still” we published, Mr Melaris hit back at claims the 1995 film was a recreation of some unseen genuine footage, saying “none existed”.
He said: “I will also prove that there is no real 1947 footage. There never was. Mr Santilli has called this film a restoration.
“There was never any real film to restore. It isn’t even a recreation. It is a work of art.
Both have now agreed to take a lie detector test and Express.co.uk plans to film and publish the results.