The Purple doctorfish is seen in various situations and roles throughout the series. He wears a white buttoned coat and glasses. He is usually the doctor seen when there is medical things involved in any episode. He has been shown to work at The Bikini Bottom Hospital, and works there as a doctor, as well he has been shown as a vet too. He resembles Dr. Gill Gilliam almost identically, though Dr. Gill Gilliam, is orange and the purple doctorfish is purple (as it is possible they are related) though some characters are known to look exactly the same, but are pallete swaps.
He is voiced by Rodger Bumpass, who also voices Squidward. He had red arms in the episode "I Was a Teenage Gary," which was his very first appearance. His next appearance was in "Suds."