20. It's a Small World After All

Lois has to attend her high school reunion and Clark accompanies her as her fiance. There, Lois learns that two (and later a third one) of her former classmates' spouses have disappeared and she decides to investigate those disappearances to find out what happened. While investigating, something strange starts happening to Clark; he is shrinking. Clark goes to Dr. Klein (Kenneth Kimmins) as Superman, who runs some tests to find out what caused this. The clues that Lois finds lead her to one of her former classmates, Annette Westman ( Elizabeth Anne Smith ), who has created a shampoo with a secret formula that causes people and things to shrink into miniatures.

She wants revenge on all those who mistreated her in school and enjoys seeing them suffer. When Lois confronts her, Annette tries to shrink Lois too but, with the help of Superman, Lois gets away and Annette accidentally pours the entire formula onto herself, causing her to shrink up her own existence. Dr. Klein finds the antidote and everyone returns to their original size.