R2-D2

A robot identical to R2-D2 (third from the left) on display at the Museum of Natural Robo-History. ^[6ACV09] Also on display are a bedspring, a trilobot, a robot monkey, a robot caveman, and a robot human. The sign reads "ASCENT OF BOT" — a reference to the documentary T.V. series The Ascent of Man, the title of which is in turn a reference to Charles Darwin's book The Descent of Man. Present are Hermes, Bender, Fry, Amy, and Leela.

R2-D2 is a robot in the Star Wars fictional universe, where he is called a droid. Futurama has referenced the character a few times.

References to R2-D2 in Futurama

In "The Birdbot of Ice-Catraz", after Bender 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 Michelangelo's David, there is a robot identical to R2-D2 in the background. ^[1]
In "A Clockwork Origin", at the Museum of Natural Robo-History, there is a robot identical to R2-D2 on display.
In "Assie Come Home", at Hedonismbot's mansion, a robot resembling R2-D2 spanks a scientist from the Academy of Inventors.
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.