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UFO hunters are preparing to unveil a series of photographs depicting an "alien" who crashed to Earth during the famous Roswell incident.

Dr. Edgar Mitchell, an astronaut who was the sixth person to land on the moon, and a team of extraterrestrial investigators will appear at the 10,000 seater National Auditorium in Mexico City tomorrow to reveal the "Roswell Slides".

These photographs were reportedly snapped by a geologist using Kodachrome film and are said to show the remains of an alien found dead in New Mexico.

(Image: Slidebox Media)

But despite international excitement over the images, some experts are already warning the unveiling could be little more than a cruel hoax.

The Roswell Slides were supposedly taken by Bernerd A. Ray, an oil exploration geologist who was working in the desert around Roswell, New Mexico, in 1947 - the year a mysterious craft fell to Earth.

The images have been locked away for more than half a century, but were allegedly found hidden in Ray's attic.

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Anthony Bragalia, a UFO investigator, has been working to establish the authenticity of the images.

He said: "This humanoid is not a deformed person, mummy, dummy, simian or dead serviceman.

"It is not a creature that finds its origin on Earth."

He said it was "not a a jump or stretch to conclude these slides indeed show the corpse of one of the creatures found fallen at Roswell".

(Image: Getty)

Nick Pope, who worked as a UFO investigator at the British Ministry of Defence, told Mirror Online he has seen one of the images, although he could not be sure whether it was a "ruse designed to put people off the scent".

"The blurry image I've seen shows a small figure, vaguely humanoid but with the disproportionately large head and eyes so often associated with the type of alien that the UFO lobby calls the grays," he said.

Although he said proof of alien visitation would be a "revelation that would have staggering implications for humanity," he warned the Roswell Slides could be yet another cynical fake.

"It's indisputable that something crashed at Roswell in 1947, but while it's fascinating to speculate that it might have been an alien spacecraft, I suspect the answer lies closer to home," he continued.

"At the time, Roswell was home to the only atomic bomb-capable squadron in the world and that whole area was dotted with highly secretive military bases and research facilities. Chances are, what crashed was a secret prototype aircraft or missile."

Pope claimed tomorrow was exactly 20 years "to the day" since he was first shown the original footage of an alien corpse from Roswell, which was quickly outed as a fake.

However, event organiser Tom Carey dismissed this suggestion.

"You are referring to the 'Alien Autopsy' hoax," he told us.

"They tell me that the dates match up. We had no idea, of course. That was the only date available to us from the schedulers at the National Auditorium of Mexico.

"We had no idea. Of course our obsessive-mindless critics seem to have latched on to it as some sort of subliminal joke on our part."

"The slides show (I believe) one of the dead ET bodies recovered from the Roswell crash of July, 1947," he insisted.

Carey previously said he had verified the date the Roswell images were taken with an expert from Kodak, who also told him the photos were not doctored.

He said the creature in the slide is four feet tall with an "insect-like" head.