R2-D2 is an astromech droid and major character in all six Star Wars films. Along with his droid companion C-3PO, he joins or supports Anakin Skywalker, Luke Skywalker, Princess Leia and Obi-Wan Kenobi throughout the saga. He first appeared in the original Star Wars in 1977 and is one of only four characters to appear in all six Star Wars films.
