A grisly beatdown was caught on surveillance video in The Bronx, authorities said.

The pint-sized creep is seen following the 69-year-old victim into an elevator of a Huntspoint building and then lurks against the back wall of the elevator car.

The victim moves toward the door and the thief pummels him, police said. He then snatches a chain off of the man’s neck and flees from the building, police said.

The suspect is believed to be in his 20’s and 5-foot-4, police said.