By Kate Ward
September 26, 2007 at 12:00 PM EDT

I’m not sure how many of you saw the season premiere of Law & Order: SVU last night, but wow, guest star Cynthia Nixon (pictured, right, with B.D. Wong and Bronson Pinchot) sure cooked up a big batch of crazy as a woman (Spoiler alert!) pretending to suffer from multiple-personality disorder to get away with her parents’ murder. Seeing her rock a convincing Russian accent and a pair of pigtails all in one episode made me realize just how much I miss seeing the red-headed firecracker on my TV screen every week.

But watching Nixon’s insanely — pun intended — good performance in the premiere made me wonder: What was the best guest star appearance over the course of Law & Order, Law & Order: Criminal Intent and Law & Order: SVU‘s combined 34 seasons? The first that comes to my mind is Martin Short’s in a 2005 SVU episode featuring the comedian as a creepy, all-too-eager “psychic” offering the detectives a hand in a kidnapping case. And though I usually have a hard time watching Criminal Intent (I can’t seem to shake the image of Vincent D’Onofrio as Men in Black’s sugar-water-seeking alien and Adventures in Babysitting‘s Thor), Michael Emerson’s stand-off with D’Onofrio’s Detective Goren in a 2001 episode had me on the edge of my seat.

Your turn, PopWatchers: Who’s the champ of cha-chung? Who takes the prize as L&O’s all-time best guest star?