Victor, an obstetrician-gynaecologist and owner of the biochemical company Chimera Inc., injects the egg implanted in his wife with an agent called Nerve Growth Factor (NGF) into chromosome six, which causes the baby to grow more neurons than usual, as a result heightening its intelligence.

's brother David, and nanny Janice, both die of an unexplainable rare form of liver cancer.

Victor had injected two other eggs with NGF, which were given to two families who work at Chimera through their fertility clinic.

Victor later finds out they had been given the antibiotic Cephaloclor, which caused the nerve cell growth process to restart and made their brains to grow too large for their skulls, killing them.

Victor then goes looking for V.J., who spends a lot of time at his father's laboratory, and sees him head under an old clock tower on the Chimera campus.

's parents come back the next day and insist that he show them the rest of the lab.

tells them that there is no fifth fetus because of a failed implantation attempt, and that he has altered the babies to make them mentally retarded so they won't be more intelligent than him.

Not only this, but he also used the method he had previously used for injecting cancer into kill David, Janice and a teacher who was prying into his life.

shows his horrified parents tanks full of E. coli genetically altered to produce cocaine, which he sold to Colombian drug dealers to finance his research.

until the bomb goes off, causing the gates redirecting a river under the clock tower to break.

Marsha quickly surmises from the fact that the 18-month child is the "failed" zygote.