Mary Katherine Gallagher - Superstar

For details on the film, see the main article: Superstar (1999 film)

In 1999, a feature length film, entitled Superstar was released, starring Shannon as Gallagher. Several of her SNL cast mates, including Will Ferrell and Mark McKinney also appeared in the film. The film featured many adult actors playing high school students.

In the film, Mary Katherine lives with her disabled grandmother (was often referred to in the SNL skits but never shown), who believed Mary Katherine bore a very striking resemblance to a young Elizabeth Taylor. Wanting to attract the attentions of Sky, the most attractive boy in school (played by Will Ferrell), Mary Katherine decides to enter the school talent competition, so that she can make him notice her. Her grandmother, however, prevents her from pursuing her dreams and forbids her to compete (the reason is later revealed that Mary Katherine's parents were stomped to death while taking part in a dance competition).