R2-D2 (phonetically spelled Artoo-Detoo , and called " R2 " or " Artoo " for short) is a robot character in the Star Wars universe .
Star Wars is an American epic space opera franchise centered on a film series created by George Lucas . The film series has spawned a media franchise outside the film series called the Expanded Universe including books , television series, computer and video games , and comic books . These supplements to the film trilogies have resulted in significant development of the series' fictional universe .
C-3PO ( pron.: / s iː ˈ θ r iː p i . oʊ / , phonetically spelled See-Threepio ; 3PO or Threepio for short) is a robot character from the Star Wars universe who appears in both the original Star Wars films and the prequel trilogy .