A new arrival on the ward who finds herself instantly drawn into competition with the “real” Lisa. Lisa Cody eventually is diagnosed as a sociopath as well, and this enrages Lisa. The two of them engage in an escalating battle of wits, exchanging insults and pranks until Lisa effectively drives Lisa Cody off the ward. Lisa Cody escapes, and Lisa later finds her living on the streets of Cambridge, addicted to drugs.