14. Dr. Nick Riviera
First appearance: “Bart Gets Hit By a Car” (Season 2, Episode 10)
Notable appearance: “Homer’s Triple Bypass” (Season 4, Episode 11)
Voiced by: Hank Azaria
With his famous “Hi everybody!” and dangerous lack of medical knowledge, Dr. Nick Riviera was, at one point, a premier supporting character on The Simpsons. With time, we've seen less and less of Dr. Nick, to the point that we now cherish what little screentime we actually get of him. When he was appearing regularly, his highpoint came during “Homer’s Triple Bypass,” where he attempted to save Homer’s life with a triple bypass surgery, only to need guidance during the operation from Lisa.
We miss his incompetency and his immoral corpse stealing, but most of all we miss his cheap infomercials advertising cheap surgeries (remember, his phone number is 1-600-DOCTORB—the extra “B” is for bargain!).