In a pre-COVID-19 timeline, Cartman informs the boys that Heather Williams had farted during P.E. class, with Cartman planning on blackmailing her in getting the boys exclusive seats to a basketball match between Denver Nuggets and Los Angeles Clippers, in exchange for not blowing up the incident to the rest of the school. The boys' plans were eventually cancelled following an outbreak of COVID-19.
Future Cartman, Stan, and Kyle later travel back to the past and pay a visit to Heather Williams, showing her a picture of her farting in P.E. class. They eventually succeed in getting their younger selves to the match as planned.
It is revealed that Heather Williams' mother works for the Coors Brewing Company, which also happens to be a sponsor for Pepsi Center, home base of the Denver Nuggets. Cartman uses her mother's status in order to blackmail Heather into getting tickets for the basketball match.
Heather Williams wears a teal blouse and dark blue pants. Her light brown hair is tied with a yellow bowtie.