You can see teachers giving the kids green Hulk gloves then having them duke it out.
The video shows round after round with 30 minutes of pre-k fisticuffs. Some of the kids got pummeled.
Parents are furious.
"He doesn't understand why his friends were fighting him. Why he got beat up by his best friend. And it was on his fourth birthday," said Nicole Merseal, one of the victim's mothers.
This video from two years ago is just being revealed.
The daycare immediately fired two teachers and called the child abuse hotline.
The case was never prosecuted but state regulators stepped up inspections.