Cat

Cat is one of the small background oddities of New New York — a creature everyone in the future calls a cat, though the show never quite lets you forget it might not really be one. It slinks through scenes rather than driving them, content to be background texture rather than a player.

The joke is in the deadpan commitment: nobody on screen questions the cat, and that straight-faced absurdity is pure Futurama. Billy West, already juggling half the cast, gives even this glancing bit of business a specific, lived-in texture instead of treating it as filler, which is exactly why the show's margins reward close attention.