Guest Stars Robert Maschio as Dr. Todd Quinlan Eliza Coupe as Dr. Denise "Jo" Mahoney Betsy Beutler as Katie Aziz Ansari as Ed Julia Campbell as Mrs. Fremont Co Starring Kevin Clash voices Elmo Lak Rana as Another Intern Caroll Spinney voices Oscar the Grouch Eric Jacobson voices Grover David Goryl as Mr. Fremont Stephanie D'Abruzzo voices A.M. Muppet (Ex Ray)