Stanley Tucci may have lost 3 LBS, but he's back in scrubs for a multi-episode ER arc starting later this season and carrying over into next. TV Guide has learned that the acclaimed actor will be playing Kevin Moretti, "a brilliant ICU turned ER chief," so expect some changes at County General - big ones. And where does that put Kovac? And Goran Visnjic? The shake-up starts May 10.