Alec Baldwin (as a marine-biologist love interest for Marge), Richard Dean Anderson (much to the delight of Patty and Selma), Terry Bradshaw and Dennis Rodman (in the annual "Tree House of Horror" Halloween trilogy), William H. Macy, Ricky Gervais, Lily Tomlin, Rob Reiner, Frances McDormand and Randy Johnson are among the guest voices that will be heard during the 17th season of The Simpsons, premiering Sept. 11. In addition, Kelsey Grammer once again will reprise his role as Sideshow Bob. All together, now: "Exxxcellent, Smithers."