Karen Plankton

Plankton is married to a waterproof supercomputer named Karen, who is also his sidekick and best friend. Karen is Plankton's own invention, assembled from a calculator and a mass of wires. She was Plankton's first invention when he was in grade school, and they dated before he became evil. Her system is built into most of Plankton's machines (including the Chum Bucket itself) so that she and Plankton can communicate while the latter is on a mission. She is a Mark II Surplus UNIVAC with 256 gigabytes of random-access memory.