Killbot #3

Killbot #3 is exactly what the name promises: one entry in a numbered lineup of homicidal robots, built for a single menacing purpose rather than a rich inner life. It shows up, does violence or threatens to, and moves the plot along without asking to be remembered as anything more than a joke with a chassis.

The gag is the economy of it — a character so minor it doesn't even rate a name, just a number, and Billy West still finds a voice for it worth doing. Futurama's background robots are where the show's writers get to be silliest, and Killbot #3 is a tiny, disposable punchline that lands precisely because nobody asked it to be more.