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Star Wars Episode III, directed by George Lucas, reveals how Jedi Knight Anakin Skywalker was lured to the dark side to become Darth Vader. It is released on 19 May.

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Ewan McGregor plays Obi-Wan Kenobi, who has been promoted to the rank of Jedi Master in the film.

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Hayden Christensen reprises his role as Anakin Skywalker, having first played the part in Episode II - Attack of the Clones.

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Yoda, Obi-Wan Kenobi (Ewan McGregor) and Senator Bail Organa (Jimmy Smits) ponder their reply to the rise of the evil Empire.

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Natalie Portman, as Senator Padme Amidala, adopts the hairstyle made famous by Carrie Fisher in previous Star Wars films.

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Yoda, voiced by film director Frank Oz, is one of the many familiar faces who put in an appearance in the film.

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Padme Amidala (Natalie Portman) and Anakin Skywalker (Hayden Christensen) see their love put to the test in Revenge of the Sith.

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Devious Chancellor Palpatine (Ian McDiarmid) and Obi-Wan Kenobi (Ewan McGregor) are imprisoned aboard a Trade Federation ship.

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Other old favourites to make a return this time around include the Wookiee Chewbacca, who is once again played by actor Peter Mayhew.

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Anakin Skywalker (Hayden Christensen) and onetime mentor Obi-Wan Kenobi (Ewan McGregor) do battle on the rolling lava surface of the planet Mustafar.