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Studios usually make sequels for the money, but director Andrew Stanton had a quite different reason for pursuing "Finding Dory," the follow-up to Pixar's 2003 undersea adventure "Finding Nemo."

"I started to worry about Dory," Stanton said at the recent CinemaCon in Las Vegas. "That just really bothered me. I couldn't sleep."

So Stanton wrote a screenplay in which the forgetful blue tang Dory (voiced again by Ellen DeGeneres) has a flash of memory about her parents (voiced by Diane Keaton and Eugene Levy), so soon she and her clownfish friend Marlin (voiced by Albert Brooks) swim to a California marine research park to find them.

New characters abound, including an escape-minded octopus (voiced by Ed O'Neill) and a pair of sharp sea lions (voiced by Idris Elba and Dominic West). But it's fondness for those familiar fish friends, especially Dory, that will make viewers want to dive into their world again.

"Finding Dory" opens in theaters June 17. See the full list of movies set for this summer at http://www.sltrib.com/entertainment/3817653-155/summer-movie-preview-blasts-from-the .