On Borrowed Time

S3 E22: Nikita and Michael infiltrate Genefex, a pharmaceutical lab making biological weapons for Red Cell. At Genefex, Nikita unexpectedly encounters Madeline, who uses a combination of chemical and electronic means to neutralize Nikita's feelings of love for Michael. Operations places Walter in "retirement." Birkoff sabotages the work of Walter's replacement to force Operations to bring Walter back to Section One.