It went completely nuts.

UK residents were left reeling after a crazed gray squirrel went on a wild Christmas rampage in Buckley, Wales, injuring a staggering 18 people in two days. Facebook posts detailing Rocky’s reign of terror are going viral.

“Warning, vicious squirrel that attacks,” wrote Nicola Crowther in the Buckley Residents Facebook Group on Dec. 26 along with a grainy photo of the furry culprit on a fencepost. “Has bitten me, attacked my friend . . . and multiple other people.”

“It’s also attacked my two Bengals, who fear nothing, and my neighbors’ Bengal cats,” she added. “Dare not go out of my house, as it’s lurking.

Another bite recipient, Sheree Davidson, told SWNS that she was taking out the recycling when the “psycho” squirrel jumped out at her from behind the bins and chomped her on the hand.

“I’ve got teeth marks on the top and bottom of my finger,” she lamented. “It proper latched on and I had to shake it off. He’s taken the top layer off my knuckle. His teeth are like pins.”

Davidson also uploaded pics of her bloody finger to the Facebook group with the caption “it had me good an proper little s – – t.”

The nutty critter, which has since been dubbed “Stripe” after the evil character from “Gremlins,” reportedly didn’t discriminate in its attacks, lashing out at the elderly, children and pets alike, and biting them everywhere from the heads to legs, SWNS reported.

Nowhere was safe, as the critter would launch at people in the gardens and even chase them down the road.

Many victims had to receive tetanus shots after getting savaged.

“After arriving at the hospital, I had to have a tetanus jab because the squirrel broke my skin,” said technician Scott Felton, 34, who was ambushed by the psychotic treehopper while smoking on his patio.

He added, “I know of someone else too who had to have a tetanus jab because theirs didn’t stop bleeding.”

During the course of its two day biting spree, the bloodthirsty squirrel reportedly injured 18 people with a staggering 21 attacked since Dec. 23.

Salvation finally came on Monday after 65-year-old Buckley resident, Corinne Reynolds decided to trap the hairy hellion.

Locally known as the “bird lady,” the mom of seven had been feeding the squirrel since the summer, but decided to act after getting bitten on the hand herself, and seeing “all the Facebook posts” regarding the attacks.

“To be honest, he was giving me cause for concern with his unusual behaviour,” said Reynolds, who wondered if Stripe had “something going on inside his head like a tumour.”

Reynolds said she especially worried about the animal’s violent tendencies as she had “an elderly lodger on blood-thinning drugs and a 2-year-old grandson playing in the garden too.”

In order to protect them, Reynolds snared the rogue rodent by putting out a cage in her garden filled with peanuts, Stripe’s favorite snack. The senior then handed him over to the RSPCA, who euthanized the critter as it’s illegal to release them into the wild in the UK.

Reynolds had mixed emotions about Stripe’s death. While reportedly “relieved” that she was able to protect her loved ones from the bloodthirsty critter, the senior was also “sad because I’m an animal lover and because of me this squirrel lost his life,” she told the Evening Standard.

“I know people don’t like gray squirrels but they are all god’s creatures to me,” Reynolds insisted.

According to the British Pest Control Association, gray squirrels are an invasive species that was introduced to the UK from North America in the 1870s to enhance the aesthetics of upper-crust estates, the ES reported.

They continued to be introduced until the 1930s, when the government finally recognized the environmental havoc they caused and banned people from releasing these problem animals into the wild.

Stripe’s biting spree isn’t the first instance of a cutesy critter going completely nuts. Earlier this month, a Singapore resident was hospitalized after getting accosted by a gang of otters, who reportedly bit him 26 times and left him thinking he “was gonna die.”