A heartless trio stabbed a 45-year-old man in the head during a brutal Brooklyn robbery that left him critically injured last week, cops said.

The victim got into an argument with the callous crew around 1 a.m. Oct. 27 on Van Siclen Avenue near Belmont Avenue in East New York, police said.

The brutes knifed the victim multiple times in the head and all over his body before ripping off his jacket, backpack, watch and cell phone, authorities said.

They then stormed off.

First responders rushed the ailing victim to Brookdale University Hospital Medical Center, where he was listed in critical but stable condition, police said.

Video released by the NYPD Monday night shows the still-at-large attackers on board an A train, one visibly grinning as he steps into the subway car.

Another can b

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