Cast updates: Mork joins SVU's 200th ep

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For Law & Order: SVU's 200th episode, NBC is doing something special: It's bringing in Patch Adams.

Robin Williams has signed on to guest star as an anti-authoritarian engineer on the Peacock's drama on April 29. After the character is on the bad end of a tragic accident, the little engineer that could decides to make the public aware that following the rules isn't always the best thing.

For those who prefer their guest stars cuter and less hairy, behold: Buffy vet Michelle Trachtenberg will appear on CW teen sudser Gossip Girl for a multiple-episode arc, according to The Hollywood Reporter. Trachtenberg will play Georgina Sparks, a lass fresh out of rehab who causes havoc in Serena's life.

That '70s Show's Kurtwood Smith will keep up his nightmare-dad persona as the father in Worst Week, a CBS pilot based on the BBC show The Worst Week of My Life. The show follows a young man who gets stuck on vacation with his fiancée and her parents.

Elsewhere, Sex and the City hunk John Corbett has joined Showtime's United States of Tara. He'll be the loving hubby to lead Tara, played by Toni Collette, in the Diablo Cody-penned comedy.

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