Dr. Kvetch is a Grouch doctor who appears in episode 2630 of Sesame Street. He is called in to inspect Oscar's niece, Irvine, who is acting nice. They realize she has the "Grouch Flu" and Dr. Kvetch prescribes rest, fluids, and staying away from nice people. He re-appears at the episode's end, when Oscar is now infected with the Grouch Flu. However, the doctor flees the scene, fearing for his own safety. He later re-appeared in episode 3589, performed by Jerry Nelson.