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Actors Stephen Boyd (1931–1977) as Charles Grant and Raquel Welch as Cora Peterson in the sci-fi fantasy ‘Fantastic Voyage’, 1966 — Silver Screen Collection/Getty Images

It is more than 50 years since “Fantastic Voyage” hit the silver screen. The film’s premise, shrinking a submarine and her crew of doctors to the point where they can travel through a patient’s bloodstream to repair damage in situ, though entertaining, remains as absurd as it was in 1966…