Making good on his recent vow to disappear from public life, Alec Baldwin is  going to a secluded spot where no one will see him: NBC, where the actor-no-longer will appear on  Law & Order: Special Victims Unit.  News of his appearance on the show came out a few weeks ago, but we now have more details about this well-hyped guest appearance, which will mark a quiet retreat into invisibility for the formerly high-profile actor. Baldwin will play Jimmy MacArthur, a columnist for a newspaper—yet another place Baldwin could go to escape public notice—“who questions the SVU squad’s motives during the investigation of a potential hate crime/rape case.” Katie Couric will play herself, interviewing Baldwin’s character. The episode will be the first directed by SVU star Mariska Hargitay, and will also be the 337th consecutive  SVU episode whose synopsis ends in the words “-slash-rape case.”