Dramatic video captures the moment a 14-year-old girl plummeted about 25 feet from a ride at an upstate Six Flags amusement park Saturday — but was caught by a group of heroic onlookers and avoided serious injury.

The teen somehow slipped out of a car on the slow-moving cable ride at about 8 p.m. at Six Flags Great Escape in Queensbury, NY, north of Albany, the Warren County Sheriff’s office said in a statement.

She could be seen in a video of the incident dangling high above the ground, with her neck stuck in the metal bar that is meant to hold passengers in.

The ride’s operator brought it to a stop after receiving a radio transmission from park staff on the ground that a rider was in distress, the sheriff’s office said.

“Her neck is stuck!” onlookers could be heard yelling in a Facebook video of the incident posted by witness Loren Lent.

Another child riding in the same cable car, who the sheriff’s office said was a relative, started yelling, “Help her, help her! She can’t breathe! She’s being choked by the bar!” Lent told The Post.

Meanwhile, a crowd of about 8 to 10 park visitors and workers gathered down below and prepared to catch the girl.

“They’ll catch you, honey, go ahead!” Lent called out to the girl.

After a few moments, the teen finally lets go and falls into the arms of the waiting good Samaritans.

The teen was treated by emergency medical personnel on scene and rushed to Glens Falls Hospital — and was later taken by helicopter to Albany Medical Center, the sheriff’s office said.

The girl, from Greenwood, Delaware, was reported to be in stable condition, with no serious injuries reported.

A 47-year-old man from Schenectady, who helped to catch the teen, was treated at Glens Falls Hospital for a back injury, according to the sheriff’s office.

It was not clear why the girl, who was not identified, began dangling from the ride. Sheriff’s investigators and park personnel inspected the ride and the car the girl was riding in and determined that everything was in proper working order — and all safety equipment was intact and operational.

But Lent claimed it took far too long for the park staff to stop the slow-moving ride after the girl got stuck.

“It shouldn’t take a minute and 30 seconds, at least from my observation, to stop a ride,” he said. “There needs to be a more expedient response time.”

“Saturday evening a guest fell from a chair on the sky ride,” theme park spokeswoman Rebecca Wood said in an email. “She was caught by a group of guests and security personnel. She was transported to an area hospital and we are in the process of gathering more information. The safety and security of our guests is our top priority and our thoughts and prayers are with our guest and her family.”

Wood said that the ride was cleared for operation Sunday — but “out of an abundance of caution, the ride will remain closed while we conduct a thorough internal review.”