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The Vampire Diaries actor joins Kellan Lutz, Samuel L. Jackson and Lost actor Daniel Dae Kim in the film, directed by Jonah Loop.
James Remar and Derek Mears have also boarded the cast, says The Hollywood Reporter.
The story centres on a young man (Lutz) who is forced to compete against other men in a modern gladiator arena after being kidnapped by a sadistic man (Jackson).
Dobrev will play Lutz's wife.
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