Allison is one of the tritagonists of the Halloween comedy-fantasy film Hocus Pocus.
Her first appearance in the film is giving the correct information of the main idea about Halloween in Miss Olin's classroom at Jacob Bailey High School when Max Dennison gives the wrong answer. She is the love interest and later girlfriend of Max. She assists Max and his sister Dani in visiting the Sanderson sister cottage on Halloween night, in which she unsuccesfully attempts to persuade Max not to light the black flame candle, which subsequently resurrects the Sanderson sisters. She subsequently helps Max and Dani defeat the Sanderson sisters before sunrise to stop them killing and consuming the life force of children, allowing them to become immortal. She demonstrates a good knowledge of the occult and supernatural when fighting the Sanderson sisters, such as when she applied rings of salt for protection against the Sanderson sisters' dark magic, leading Winifred Sanderson to mockingly label her "a clever little white witch". Following the death and defeat of the Sanderson sisters at sunrise, she officially becomes Max's girlfriend.
Allison, unlike Max, is highly passionate and interested in Halloween and the supernatural, and shows a particular interest in the history of the Sanderson sisters. She comments that previously her mother was the owner of the Sanderson sisters' cottage when it was a museum, however she abandoned such ownership following several strange and supernatural occurrences in such property. Allison and her family also appears to be rather wealthy; they are shown living in a large house in Salem, and on Halloween host an extravagant costume party with a French aristocratic theme.