I'm Lisa Simpson's cat.
Name's Snowball.
Snowball V, actually, but everyone calls me Snowball II.
Here's the scoop: Snowball (I) was run over by the Mayor's brother, Snowball II (whom I look just like) was run over by Dr. Hibbert, Snowball III drowned in the fish tank, Snowball IV aka Coltrane lept out a second-story window, then the Crazy Cat Lady threw me at Lisa, who named me Snowball V but decided to call me Snowball II to save money on the collar.
Whew.