Jimmy becomes a part of a experimental project by two ladies who want to put the people at their control. Lois is mad with all the Clark's suddenly disappearances and begins to date Scardino.

Investigates the theory put forward by biologist David Haig, who suggests that, far from being a period of physical harmony for mother and baby, during pregnancy the two are engaged in a struggle through the placenta to control available resources, such as oxygen and sugar. While the baby's genes are trying to promote growth, the mother's genes are trying to restrict the draining effect.