A courageous 15-year-old Long Island girl — armed only with a table lamp — fought off a monster who climbed through her bedroom window and, without saying a word, pressed a damp cloth over her nose and mouth.

Moments after the fiend fled, the terrified teen and her mom — in a scene out of a horror movie — watched as “a pair of hands reached back into the house,” a detective said, describing how the invader tried to get back in.

The bizarre case — eerily reminiscent of the kidnappings of teens Polly Klaas in California and Elizabeth Smart in Utah, who were dragged from their beds — happened early Sunday.

The girl was asleep in her first-floor bedroom in upscale Great Neck at 4:40 a.m. when “she felt a wet rag being pressed over her face, and she had a male sitting on top of her,” said Det. Lt. Kevin Smith.

The man, a complete stranger, “had one hand over the rag — over her nose and mouth — and the other hand was on her neck,” he said.

She fought him off, “picked up a lamp and was ready to hit him with it,” Smith said.

He ran out a rear door.

The mother, hearing her daughter’s cries, joined the girl — and moments later, they saw the ogre’s hands coming through a front window.

The mom’s screams drove him away, but they saw him again near another window before he fled for good.

He left behind the cloth — which is being tested for chloroform or other chemical — and the “USA” cap he was wearing.

The mom said the family are Russian immigrants. The teen suffered only a bruised face.