Artoo-Detoo was a droid who appeared in the episode. Behind him is a droid exclusive to the film, R5-D4.
"OH MY GOD YOU DON'T KNOW WHAT STAR WARS IS?! GET OFF MY WIKI!!!"
-A mad Artoo.
Star Wars was a movie released in 1977. It showed many astromechs, including R2-D2 and R5-D4.