A “hot head” former city Department of Corrections captain sucker-punched a man in an unprovoked attack, according to a lawsuit.

Video provided to The Post shows the moment Marc Silverman unleashed a flurry of punches at Christopher Spinella, a graphic designer who was bringing a box of T-shirts to a woman who lives in Silverman’s Staten Island apartment building.

The minute-long clip shows Silverman arguing with Spinella in the parking garage, then the former corrections officer lunges at the graphic designer, punching him in the face.

“To be quite frank, he beat the s—t out of me,” Spinella, 37 told The Post.

Spinella is now suing Silverman, 55, in Staten Island Supreme Court for unspecified damages.

Silverman called the cops on Spinella after the beating — but the graphic designer’s Tesla captured the ordeal on camera.

“They had their guns drawn on me,” Spinella said of responding officers. “They came to arrest me…it wasn’t until I showed them the footage that they arrested him.”

“He tried to make it seem like he was the victim in the situation,” Spinella added.

Silverman was charged with assault and harassment, but the case was dismissed by the Staten Island District Attorney’s Office in April.

The Staten Island District Attorney’s Office did not respond to requests for comment regarding the dismissal.

It’s the latest accusation of violence against Silverman, who worked for the Department of Correction for more than 25 years before retiring with a pension in March 2016.

The former jail captain was arrested in 2011 for criminal obstruction of breathing and harassment after his mother accused him of choking her, according to administrative court filings.

Silverman, who once sarcastically listed his job as “Captain at New York Zoological Society,” was also arrested in October 2014 after authorities said he beat his 12-year-old son, according to the Staten Island Advance, but both the 2011 case and 2014 case were tossed.

In November 2013, an administrative judge recommended Silverman be suspended for 30 days after getting into a fistfight with a colleague who called him out for using his cell phone at work, according to the same filings.

“The district attorney’s office has been giving this guy sweetheart deals time after time,” he added.