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Snowball (a.k.a. Snowball I) was the first cat owned by Lisa. He was followed by Snowball II, Snowball III, Snowball IV and Snowball V. He 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 whilst she explained that Snowball I had died that year.

During a heatwave one summer, Snowball I fanned a block of ice with his tail when the Simpson family couldn't afford an air conditioner. he did not like this, and eventually, the family got an air conditioner, but Homer put the temperature too cold and the cat shook as he walked across the living room.

Snowball was, according to Lisa in a poem, run over by a Chrysler. Snowball is buried in the Pet Cemetery, which is next to the Springfield Cemetery...