The doctor in the episode "Bart the Daredevil" is voiced by who?
Bart the Daredevil:  Bart's first stunt ends in injury, and despite the family and Dr. Hibbert's best efforts, he continues to attempt stunts. 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".
Harry Shearer