Ken Watanabe and Tom Hardy have signed on for Christopher Nolan's Inception for Warner Bros., starring opposite Leonardo DiCaprio.

According to The Hollywood Reporter, the story was written by Nolan and is a contemporary sci-fi action film set within the architecture of the mind, with DiCaprio as a CEO type. Watanabe will play the film's villain, a man who is blackmailing DiCaprio. Hardy is a member of DiCaprio's team.

The duo join a cast that includes Joseph Gordon-Levitt, Cillian Murphy, Ellen Page and Marion Cotillard.

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Nolan and the studio are aiming for a summer shoot ahead of a 2010 release.