The Law & Order franchise of shows is known for the caliber of its guest stars. From movies, TV and theater, they come to play victims -- or, more often, perpetrators -- of horrible crimes. And to kick off the new season of Law & Order: Special Victims Unit, the producers scored a couple of doozies. Luke Perry, formerly of Jeremiah, Oz and the original 90210 plays the father of a troubled boy, and Sara Gilbert of Big Bang Theory and Roseanne fame plays a rape victim who had to give up her child. The two of them participated in a conference call recently with show producer Neal Baer, and they talked a lot about the process of playing such intense roles -- including a certain Dylan McKay... read on for the highlights of the conference call.