Karen Jean Hillenburg (née Umland; born November 10, 1962) is the widow of Stephen Hillenburg. She works as a chef at a cooking school and is an active board member at Planned Parenthood.


Karen Plankton was named after her.

She was mentioned in the audio commentary of "Plankton!" on The Complete 1st Season Disc 1 DVD.

The SpongeBob SquarePants Movie 086
"We paid nine dollars for this?"
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