The Fox musical is bringing back Max Adler, who played McKinley High bully Dave Karofsky, for a major arc in the show's final season, according to The Hollywood Reporter. [...] it was largely because of the terrible treatment Kurt received from Karofsky and others at McKinley High that drove him to enroll at Dalton Academy, where he met his on-and-off love Blaine. In Season 3, he even tried to commit suicide after being outed at his new school, but his attempt failed.