Bret-MichaelsReports have Bret Michaels rehabbing from his brain hemorrhage in hopes of appearing in the May 23 finale of Celebrity Apprentice. He’ll also be a focal point of the June 11 season opening episode of the Nick at Nite stop motion comedy series Glenn Martin, DDS, which got picked up for its second season. The former Poison frontman and Rock of Love star plays himself and voiced the episode right before he suffered the health scare. Howie Mandel also appears in the episode. Betty White, Gabourey Sidibe, Mel Brooks and Fergie head a long list of celebs providing voices this season.