British thespian Michael Sheen has signed on to join Samuel L. Jackson in the thriller Unthinkable and also will make an appearance in Tim Burton's re-imagining of classic children's story Alice in Wonderland.

According to Variety, Unthinkable is directed by Gregor Jordan and looks at the ethics of torture after a terrorist threatening to detonate nuclear devices in the U.S. is questioned by a black-ops interrogator and an FBI agent (Carrie-Ann Moss).

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The film starts shooting this month.

The actor will also have a role in Alice in Wonderland, in which Johnny Depp is playing the Mad Hatter.

Alice in Wonderland is currently in pre-production and slated for a March 5, 2010 release.