The Purple Doctorfish is a purple-colored fish doctor who 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 are medical situations in episodes.
His name has yet to be revealed, although it is uncertain if he is the same fish as the orange Dr. Gill Gilliam. The character Perch Perkins also appears both purple and orange, and he was also revealed to be the same fish.
He first appeared in "I Was a Teenage Gary," where he told SpongeBob that in order to cure Gary, he must inject him with Snail Plasma because he was "too squeamish."
He later appeared in "Suds," where he assigned treatment to SpongeBob when he had the "suds."
In "Squid's Day Off," he helped get Mr. Krabs' arms back on him after they fell off.
He made a brief appearance in "Band Geeks," thinking that there was a dying animal on Squidward's premises.
He performed 20 hour-surgery on SpongeBob's butt by repairing it with staples and glue in "I Had an Accident."
He later appeared in "The Lost Mattress," where he told SpongeBob, Patrick, and Squidward to retrieve Mr. Krabs' money after he fell into a "cash-coma."
He made a brief cameo in "SquidBob TentaclePants," where he told a woman that she had given birth to a healthy baby, only to have the fused SpongeBob and Squidward to teleport in the baby's place as he shows it to the woman.
In "The Two Faces of Squidward," he performed Squidward's operation. He was paranoid with SpongeBob's interruptions during the final stages of the operation.
Shower In A Can!
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He had red arms in "I Was a Teenage Gary," which was his first appearance.
He appeared as a mini LEGO figure in the LEGO Bikini Bottom Hospital set.
He is both a vet and a doctor, it is unknown if he had quit as a vet after "I Was a Teenage Gary," "Shellback Shenanigans," and "Pineapple Invasion."
In the fandom, he is nicknamed "Dr. Forrest" due to the fact that there is an unknown doctor that only has had that name heard.