After Denzel Crocker used Timmy's machine that made him half-man, half-cheese and decided to use his powers for evil purposes, he eventually captures Timmy's fairies and puts them into his Magic Blaster. Denzel wishes to have great hair, and then wishes to win the love of his high school crush, Mary Lou. Denzel arrives at Mary Lou's house in a limousine wearing a tuxedo, holding flowers and a diamond ring. He asks her to go out with him, with Mary Lou saying yes, but then Denzel yelled at her with the exact words she used to crush his heart at the Sock Hop, which were "Well, forget it! You're ugly and creepy and stop calling me!", which caused Mary Lou to run away crying.
Mary Lou has medium length blond hair with a dark blue headband. She wears silver earrings, a striped blue shirt, dark blue pants and blue shoes.