He wears a white coat with a red circle-backslash symbol, he also wears a black eye mask and a head mirror.
SpongeBob and Patrick are playing Mermaid Man and Barnacle Boy and see Squidward, who they think is Doctor Negative, and attack his vegetable garden and eat the vegetables. Squidward is about to clobber Mermaid Pants and Barnacle Star, but Squidward remembers he is running late for work. At the Krusty Krab, Mermaid Pants and Barnacle Star are singing the Mermaid Man and Barnacle Boy Action Theme, making Squidward annoyed. He tries to get them to stop talking about Mermaid Man and Barnacle Boy to no success. Squidward tells SpongeBob to take out the trash, but instead, they punch the trash, and the Krusty Krab gets dirty and all the customers leave. Mr. Krabs comes out of his office and sees that SpongeBob and Patrick are playing Mermaid Man and Barnacle Boy, he shows Squidward his secret collection of comics books (making Squidward call him a "comic book geek." Mr. Krabs then shows him his Captain Tightwad costume and dresses Squidward as Dr. Negative. Now in costume the two fight with Mermaid Pants and Barnacle Star, Mermaid Pants points out that "no superhero should fight a super villain unless that super villain has committed a crime." They go to a bank and Captain Tightwad and Dr. Negative pretend to rob it, until they get beat up by a security guard. Mermaid Pants decides to skip to the end of the store and pick up evil supplies for the super villains. Now, Captain Tightwad and Dr. Negative have Mermaid Pants and Barnacle Star over a pool of boiling oil, but Dr. Negative plots to actually fry Mermaid Pants and Barnacle Star. The heroes tip over the lift and are set free, but Captain Tightwad and Dr. Negative get fried. Mermaid Pants and Barnacle Star then fake drive into the distance.
Shower In A Can!
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Vegetable Control: This power may have been made-up by SpongeBob, that Dr. Negative can resurrect vegetables by singing.
Toenail Attack: Not really an attack, but Doctor Negative was able to stop SpongeBob and Patrick from climbing up the wall by cutting his toenails in their path.
Tentactle Attack: Dr. Negative was able to "attack" Mermaid Pants by getting his tentacle stuck through SpongeHob's holes.
"Oh, don't tell me, Doctor Negative."
"No Mr. Bob, I expect you to fry. Mwa ha ha ha ha ha ha!"
It is unknown of Doctor Negative is a real doctor of if his title is just a clever name.
His name is a parody of Mister Negative, a super villain who appears in various Marvel comics.