DUNSTABLE, England (Wireless Flash) -- In the 1987 film "Predator," Arnold Schwarzenegger encounters an invisible alien which only becomes visible to humans in rain or fog.

Now researchers in Dunstable, England, have discovered a type of ghostly entity that does the exact same thing.

Ross Hemsworth, who heads up the so-called Phantom or Fraud Project, says the spooks can only be seen when sprayed with water -- whether it's artificially generated or genuine London fog.

His team has photographed the Predator-like paranormal creatures across England and in New Jersey, making the spooks appear by using everything from hair spray, water misters and even their own breath.

Hemsworth says most of the entities appear to be human or animal-shaped and he believes they might be "anti-matter" forms from a parallel dimension.

The unusual creatures will be featured on an upcoming DVD issued by the Phantom of Fraud Project.