Orlando Brown's downward spiral has one of his friends seriously worried the end is near ... and he's calling on one man to save the troubled ex-Disney star.
Brown's set to appear on "Dr. Phil" Friday, in an intervention-type setting orchestrated by Brown's friend who claims he's suffering from a mental disorder and has burned so many bridges ... he's run out of resources for help.
The clip's pretty shocking -- both because of what the friend says about the "That's So Raven" star ... and the look in Orlando's eye(s) when he sits face-to-face with Dr. Phil.
We broke the story ... several of Brown's friends staged an intervention for him in October to encourage him to enter a rehab facility. It worked -- but only temporarily -- and it's clear people are still very concerned about him.