What is the name of the actress who voices Karen Plankton?

The actress who voices Karen Plankton is Jill Talley.

Karen Plankton is the waterproof supercomputer who serves as Plankton’s wife, adviser, and frequent partner in schemes against the Krusty Krab. Jill Talley provides Karen’s English voice, balancing the character’s dry intelligence with comic impatience toward Plankton’s plans.

Talley is an American actress and comedian who performed improv with Chicago’s Improv Institute and The Second City. She and her husband, Tom Kenny, both appeared on the sketch-comedy series The Edge and Mr. Show before becoming SpongeBob cast members. Talley has played Karen since 1999, shortly after the character’s introduction.

Karen is often confused with other female voices from the series, especially Lori Alan’s Pearl Krabs and Carolyn Lawrence’s Sandy Cheeks. Tom Kenny is also a frequent wrong option, but he voices SpongeBob and several additional characters, not Karen. Karen and Plankton first appeared together in the episode “Plankton!” and run the unsuccessful Chum Bucket.