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Although Plankton and Karen are married they often fight. For example, in "Single Cell Anniversary," they fight when Plankton had never given Karen a present for their anniversary; but Plankton soon learns from SpongeBob that he has to show his love, and plays a romantic song for Karen. Karen also comes up with a lot Plankton's plans, but he often steals credit for said plans. Although the two fight a lot, Karen still loves Plankton, an example of this is in the episode, "Enemy In-Law," where Karen is jealous of Mama Krabs. Plankton also doesn't let Karen help him that much like in "Salsa Imbecilicus" where he mutes her and didn't let her even help make the Salsa.