From Disney's Hollywood Studios Wiki
Darth Vader is a Sith Lord from the Star Wars Saga. In the Original Trilogy Vader's was voiced by James Earl Jones, while David Prowse was the person in the actual costume. In Star Wars Episode III: Revenge of the Sith, James Returned as the voice, but Hayden Christensen, who played Anakin Skywalker in Star Wars Episode II: Attack of the Clones and Episode III, was the person inside the suit.
 Studios References
Darth Vader's Largest role is as the villain in the Jedi Training Academy.
Darth Vader's Costume can also be seen in the AFI Showcase at the end of the Studio Backlot Tour. He is also the 3rd best villain of all time according to AFI's 100 Heroes and Villains list.
In the extended queue line for Muppet*Vision 3-D you can see a poster of Star Chores an obvious spoof of Star Wars, with Fozzie Bear dressed up like Vader, similar to his depiction of "Darth Bader" in a Star Wars episode of The Muppet Show.
 Character Synopsis
Born as Anakin Skywalker, who later went on to become a Jedi and became a general in the Clone Wars, Vader rejected his real name once he turned to the Dark Side, in a futile effort to save his forbidden Wife Padme Amidalla. He terrorized the galaxy for many years, but in the end returned to the side of good, just before his Death.
 Film Appearances
While Anakin Skywalker appeared in all 6 Star Wars Films, Darth Vader, in the black suited evil form we know him as, only appeared in Star Wars Episode IV: A New Hope, Star Wars Episode V: The Empire Strikes Back, Star Wars Episode VI: Return of the Jedi, and he made a brief cameo in Star Wars Episode III: The Revenge of the Sith.
 Other Info
In Toy Story 2, the character Zurg is an obvious spoof of Darth Vader. He even steals Darth Vader's famous line and tells Buzz that he is his Father.
 Performed By
David Prowse - In Episodes IV-VI.
James Earl Jones - As the Voice of Darth Vader in Episodes III-VI.
Jake Lloyd - As Young Anakin Skywalker in Star Wars Episode I: The Phantom Menace.
Hayden Christensen - As Anakin Skywalker Star Wars Episode II: Attack of the Clones, both as Anakin and Darth Vader in The Revenge of the Sith, and as Anakin's Ghost in the latest revision of Star Wars Episode VI: Return of the Jedi.
Matt Lanter - As the voice of Anakin Skywalker in Star Wars: The Clone Wars.
Sebastian Shaw - As Anakin's Ghost in the original theatrical release of Return of the Jedi.