Dr. T.

Dr. T. is a mysterious evil human inventor who appears in Chapter 1 Part 12. Little is known about him, other than he teamed up with Plankton to build an army of Mega-Crabs. He was murdered by Eugene Krabs when Mr. Krabs removed his air helmet after jailing Plankton and consuming some of the Mega-Crabs. Fortunately, Dr. T had put in toxic fluids, so Krabs died, but not before Patrick merged with him, keeping him alive.