The trailer for the long-delayed Rachel McAdams - Eric Bana film The Time Traveler's Wife has finally been released.

The film - part love-story, part science-fiction - portrays the lives of a husband and wife whose relationship hits the rocks when Bana's character cannot stop himself from travelling through time.

Based on the book of the same name by Audrey Niffenegger , it was due to be released last year but should be out in August.

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