R2-D2

 is a in the Star Wars, where he is called a. Futurama has referenced the character a few times.

References to in Futurama

 * In "The Birdbot of Ice-Catraz", after short-circuits in the ice, he makes one of the sounds that R2-D2 makes.
 * In "Obsoletely Fabulous", when Bender is playing with the robot scratching post, there is an object resembling R2-D2 in the foreground.
 * In Bender's Big Score, when Nudar shoots 's , there is a robot identical to R2-D2 in the background.
 * In "A Clockwork Origin", at the Museum of Natural Robo-History, there is a robot identical to R2-D2 on display.
 * In the game, after Bender is injured, he sometimes makes an R2-D2 sound.
 * In "The Fry and the Furious!", a robot identical to R2-D2 responds to Zapp Brannigan's use of the phrase "are too".
 * In "How to Secede Without Really Trying", at one of the press conferences, there is a robot resembling R2-D2 in the background.
 * In "The Board Game Games", the throne that Bender sits on is made of, among other things, parts identical to those of R2-D2.

Trivia

 * With the exception of the episodes that make up Bender's Big Score, all of the episodes in which is referenced were written by the same person.