Cats are small carnivorous mammals native to planets Earth and Melmac. On Earth, cats are usually kept as pets, while on Melmac they are usually served on lunch, breakfast or dinner.

Some known Melmacian cat dishes include chili cat, "El Gato" stew, feline and fries, calico claws, cat tails, whisker omelet, breast of cat, cats Benedict, filet of cat, stir-fried cat, feline mignon, and cat fudge sundae.

The Tanner family owned two cats over the course of the show. The first cat was named Lucky. When Lucky passed away, ALF got the idea of accepting free cats advertised in the newspaper classifieds so he could eat them. Willie insists that ALF gives away all of the cats, but they keep the last one and Brian names him Lucky II.

On Melmac, it is not popularly acceptable to be a cat sympathizer and abstain from eating cats. Melmacians

would spit on such "cat lovers." ALF is ashamed to find that he has become a cat lover when he first sees a kitten. Previously, he had never seen a kitten (except for bits of them in a stew), but only full grown cats.

Melmac cats are taller than Earth cats, and they can stand up and sing and talk. Earth cats are much shorter than ALF, and do not speak.

Garfield the CatEdit

Garfield the Cat, a famous cartoon character used by licensing just like animated ALF in the 30-minute movie Cartoon All-Stars to the Rescue was a possible reference to Lucky. ALF once threatened Garfield to help a boy to overcome his addiction to drugs by saying, "Do you want to help, or do you want to be lunch?". Garfield quickly arose with no question and complained, "My luck of being stuffed by a pushy alien". This was critically hated by Garfield fans, and the entire movie was not a critical success due to mixing storylines.

On one Macy's Thanksgiving Day paradein 1989; ALF, as himself, hosted the event when Garfield as a giant balloon was being carried on the parade. He calls him "Garfield the Delicious" and says there's not enough mustard in the world.