Dark tells the story of a teenager (newcomer Alexander Ludwig) who learns that he is the last of a group of warriors who have dedicated their lives to fighting the forces of the Dark. Traveling back and forth through time, he hunts for clues while encountering the forces of evil and discovers that the future of the world rests in his hands.
Smith is playing the teen's older brother, an edgy young man with piercings and tattoos who questions their father's authority.
Eccleston is playing the movie's villain, the Rider.
Also in the cast are Amelia Warner (Aeon Flux), Emma Lockhart (Batman Begins), Gary Entin, Edmund Entin, Jonathan Jackson and John Benjamin Hickey (Flags of Our Fathers).
Ian McShane and Frances Conroy have already been cast.
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