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Disturbing video shows a disabled man getting knocked unconscious by a construction worker inside the elevator of a Manhattan building – and the victim is now filing suit over the unprovoked attack.

Richard Regen, 60, had been heading to rehab for a stroke he suffered two years ago when construction worker Andrew Caban allegedly shoved him and then punched him twice in his Chelsea building elevator, according to the Manhattan Supreme Court suit filed Tuesday and his lawyer.

After Caban, 48, allegedly lands the knock-out blow, he calmly waits to exit the elevator while Regen lays momentarily unconscious on the vestibule floor, the footage shows.

The brute appears to turn around, say something and gesture as he leaves an incapacitated Regen behind.

For roughly three more minutes, Regen can be seen struggling to get out of the elevator and unable to get himself off of the ground.

Regen was hospitalized for eight days while he suffered a brain bleed, traumatic brain injury and seizures, his lawyers from the Merson Law firm said in a statement Tuesday.