While researching for her new part of playing a scientist, Kelly discovers the new color bleen. Al finds that bleen grows hair.

Lois tries to convince Clark that his decision to break up is a mistake. When an old Lois' friend comes to Metropolis, she tries to make Clark jealous. But this friend has plans to use her in a Druid sacrifice. Clark finally realizes that he can't stay without Lois, but that may be too late now.

After a trip to a petting zoo, Lisa finds herself unable to eat lamb exposing her to ridicule and resentment from her father and friends. But with help from Apu and Paul and Linda McCartney, she makes an effort to stick to her new vegetarian view.