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If you were looking for the article about the whale, then see Don the Whale.
If you were looking for the article about the food critic, then see Don Snapper.
If you were looking for the article about the surfer, then see Grubby Grouper.
He is light purple with a dark purple dorsal fin. He wears a dark blue suit, and has a dark olive green tie. He is "a charismatic head ad executive of the ad agency Grouper, Goby & Koi."
His "sharp mind and devastating charm make him an irresistible force. When Don's in the room, everyone laps up his words like overpriced organic honey."
In the episode, "Mr. Krabs goes to Don for help as he tries to launch his line of frozen Krabby Patties. If anyone can sell crab in an ocean, Don can!"
Don first appears when Mr. Krabs shows him a "commercial" of Frozen Krabby Patties he made by himself. Don is not impressed by it, however, he tells Mr. Krabs that if he wants to be rich, he should keep his mouth shut and listen to him and the company. Afterwards, he introduces the staff of executives to Mr. Krabs and SpongeBob (whom he referred to as a yellow box). Don shows Mr. Krabs various slogans on what the Frozen Krabby Patty should say on the box. SpongeBob comes up with a slogan and says, "Krabby Patties: Tastes so nice that they taste nice". Don rejects it at first, but, he decides to have his star, Patrick use it for his commercial. After the rehearsal, Don manipulates Mr. Krabs into changing the Krabby Patty formula so he can become rich faster, to which a gullible Mr. Krabs agrees to. Don gave SpongeBob and Mr. Krabs a tour to his factory. However, during the tour, SpongeBob discovers that his workers are suspiciously filling a filler with sand, but Mr. Krabs tells SpongeBob there's nothing to worry about for it was part of the process of making Frozen Krabby Patties. After Mr. Krabs gets a check that holds a huge amount of money, Mr. Krabs turns the old Krusty Krab into a museum and his office is now a gift shop. Soon or later, Don, Mr. Krabs, and Patrick become so popular that everyone in Bikini Bottom kept buying more Frozen Krabby Patties, which completely disheartens SpongeBob. Eventually, SpongeBob learns that the Frozen Krabby Patties that Don has been manufacturing are made out of sand and he decides to expose him for the fraud that he is. SpongeBob gives Patrick a freshly made Krabby Patty and their friendship is restored. Later, at the shareholder's meeting, Don and Mr. Krabs allow Patrick to speak to the audience before airing the 400th commercial. Patrick begins his speech and with SpongeBob's guidance reveals to the audience that the frozen patties are made out of sand. The audience and Mr. Krabs are shocked at this sudden realization and learn that Don and his executives are frauds. With his secret exposed, Don walks off the stage while the audience vomits out sand. It is unknown what happened to him after the frozen patty factory was shutdown. However, it is assumed that he and his executives were arrested by the authorities after his fraudulent scheme was exposed.
His name is a parody of the Mad Men character "Don Draper," whom Jon Hamm also played.