The Thing and I: Bart, Lisa and Maggie hears strange noises in the attic, with Homer and Marge going up there for some reason. Soon, they discover a maniac kid named Hugo, who is soon to be revealed the conjoined twin brother of Bart, and he soon goes loose.

The Genesis Tub: During a science experiment if soda will dissolve a rot tooth, an electricity accident converts into her experiment, creating a race of miniature beings, evolving into a rapid rate, and building their own economy. Unfortunately, during Lisa's study on the race, Bart destroys some of the ecosystem and the race sets up an attack on him.

Citizen Kang: Homer is abducted by aliens Kang and Kodos and the latter decides to also abduct both Bill Clinton and Bob Dole, and poses as them in order to run against each other.