It feels like a sweeps moment -- a big name star guesting on a long-running show. But it's not set for sweeps. It is, however, a special occasion and a reason to do something festive. So, on April 29, Robin Williams will make a guest appearance on Law & Order: SVU in part to celebrate the 200th episode of the intense NBC crime drama. The Oscar-winning actor (for Good Will Hunting) is no stranger to television, as we all know. Till the day he dies, he'll be Mork. Na-noo, na-noo. As an alien from the planet Ork, Robin Williams was catapulted from obscure comic actor to overnight sensation thanks to the Garry Marshall sitcom Mork & Mindy. It was the beginning of a stellar career.
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