Question: In "The Simpsons"' episode "I Married Marge," Marge thinks she may be pregnant and visits which doctor whose voice is provided by Harry Shearer?
Sentence (from "Dr. Hibbert"): His speaking voice is provided by Harry Shearer and his singing voice was by Thurl Ravenscroft, and he first appeared in the episode "Bart the Daredevil".
Relevant evidence: Yes