|Gender:||Male and Female|
|Color:||Brown, Black, Grey, Green, Blue and Yellow|
|Interests:||Root Beer, Helping Cousin Plankton|
Plankton's Cousins 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. There are approxamatly ten thousand cousins of Plankton all together. Unlike Plankton, they're not evil. They wanted rewards if they helped Plankton like: Some memory for their laptops, an extra string from a banjo, matching boots, but then all of them wanted Root Beer. Some of them also appear in One Coarse Meal briefly, showing that they were eaten by a whale. In that episode, apparently, they're Plankton's ancestors, not cousins.
Because they all were 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).
 Known Names
- Billy Bob
- Billy Jim
- Billy Billy Bo Billy Banana Fana Fo Filly
- Fletcher McGee
- One of Plankton's many cousins is mentioned in the episode "The Algae's Always Greener" when Plankton says he has not reviewed anything except for exercise videos that one of his cousins sent him.