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Plankton's cousins are Plankton's family that first appear in the episode "Plankton's Army." They appear and act in the manner of a modern hillbilly. The majority of them can read except for one, Clem. Unlike Plankton, they are not evil. They want rewards if they help Plankton, such as memory for their laptops, an extra string for a banjo, matching boots, and all of them want root beer.
Because they are all hillbillies, it would be obvious that little things could please them.
One common like between all of them is their enjoyment of root beer. They are also fond of Plankton's computer wife, Karen. They also laugh quite a bit, when Karen was joking about Plankton's first name (Sheldon).