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The Incredible Hulk actor joins John Krasinski, Drew Barrymore and Kristen Bell in the film, according to The Hollywood Reporter.
Whales tells the true story of a news reporter (Krasinski) and a Greenpeace volunteer (Barrymore) who try to save three gray whales trapped under ice in the Arctic Circle in 1988.
Nelson has landed the role of a wildlife expert in the Ken Kwapis-directed movie, which is based on Tom Rose's non-fiction book Freeing the Whales: How the Media Created the World's Greatest Non-Event.
Production is scheduled to begin in the autumn.
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