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Snowball was the first white female cat owned by Lisa. She was followed by Snowball II, Snowball III, Snowball IV and Snowball V. She has only briefly appeared in a flashback, but has been mentioned numerous times. Her death was never seen. She was the family's first pet, followed by Snowball II and Santa's Little Helper.
Snowball I was first mentioned in a Christmas letter Marge was writing where she explains that Snowball I had died that year.
During a heatwave one summer, Snowball I fanned a block of ice with her tail when the Simpson family couldn't afford an air conditioner. She did not like this, and eventually, the family got an air conditioner, but Homer put the temperature too cold and the cat shook as she walked across the living room.
Snowball was, according to Lisa in a poem, run over by a Chrysler. At a later point it emerged that Snowball was run over by Clovis Quimby, drunkard brother of Mayor Quimby (in a parody of what could be any of the Kennedy brothers, Roger Clinton, Jr., or even Billy Carter). Snowball is buried on the Pet Cemetery, which is next to the Springfield Cemetery. However, at one time, her grave was seen in the Simpsons' backyard, next to Snowball II's grave.
Snowball has been shown as black in some pictures, however, she is generally seen as white. Snowball was so-named due to her white-colored fur, though in a few occasions, Snowball I is pictured similar to Snowball II. Snowball II's name is an obvious use of irony.
 Life after death
Although the Sunday school teacher, Mrs. Albright, told Lisa that Snowball cannot go to Heaven, this proves to be wrong as Snowball has been seen in Heaven by characters who have undergone near-death experiences, including Bart, and sometimes in flashback sequences. She was listed as voting for Sideshow Bob in mayoral elections.
 Treehouse of Horror
One time, Bart and Lisa try to bring back Snowball I using a zombie spell in the pet cemetery, but inadvartently awaken the human corpses in the nearby Springfield Cemetery.
 Behind the Laughter
Many The Simpsons books are jokingly dedicated to her. For example, in The Simpsons: A Complete Guide to Our Favorite Family (in which she is mistakenly colored black), the dedication reads, "We hope that they change your catbox in kitty heaven more often than we did down here." In The Simpsons: Treehouse of Horror: Fun-Filled Frightfest, published by HarperCollins in 2003, the more morbid dedication reads "We're sorry you're gone. You would have made a tasty Hors d’œuvre." Also, The Simpsons Holiday Humdinger, published by the same company in 2004, says, "As this snow sculpture thaws on the first warm day, so will our hearts melt whenever we think of you." A passage in Cartooning with the Simpsons, published by Scholastic, reads, "Dedicated to the memory of Snowball I: You may be gone, but we still remember how to draw you." Many other Simpsons books are dedicated to her, but the dedications ceased in publications from 2005.
 See also