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4: Alan Rickman.
Image Source: theodysseyonline.com
Alan Rickman may be best known for playing Professor Snape in the Harry Potter film series, but he had a rich working history as an actor, including playing Marvin The Paranoid Android, literally the only character that makes the Hitchhiker’s Guide To The Galaxy film worth watching. He found fame as he grew older, and was truly at the peak of his acting career when he was cruelly snatched from us by cancer.