MMA fighter Justin Wren was sick to his stomach when he saw video of kids repeatedly beating up a 12-year-old boy with special needs ... so he decided to do something about it!
The horrifying footage of Rayden -- who's autistic, diabetic and deaf in his right ear -- is going viral ... showing a bunch of kids mercilessly beating and mocking him. It got so bad, Rayden began scribbling suicidal messages on his arm.
Wren's blood began to boil when he heard about the story -- so he got in contact with Rayden's family to see if he could help out and they gladly accepted the offer.