The document summarizes the psychological disorders and suggested treatments for several characters from the show "The Grim Adventures of Billy and Mandy". Billy is diagnosed with mental retardation and suggested treatment includes special education. Mandy has borderline personality disorder and her treatment would include dialectical behavior therapy and medications. Nergal Jr. has depressive personality disorder and his treatment would include antidepressants. Jeff the Spider has separation anxiety and his treatment would involve family counseling and anti-anxiety medication.