The real Number 6 is subjected to aversion therapy to alter his tastes and instincts, and then drugged to wipe his memory of the treatment. When he awakes, he is treated as "Number 12", while the lookalike assumes the role of Number 6. The real Number 6 is informed by Number 2 of the plan to break "Number 6" (actually the impostor) by convincing him that he is not Number 6 at all.