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The working titles of this film were Portofino and Affair in Portofino. According to a January 9, 1956 Hollywood Reporter news item, the studio considered Betty Grable for a starring role. As described in March 1956 articles in Hollywood Reporter, the jungle set at RKO Path Studios cost $300,000 and included sixty exotic birds. Although March 1956 Hollywood Reporter news items add Liz Silfer and Yma Sumac to the cast, their appearance in the final film has not been confirmed. Back from Eternity was a remake of the 1939 RKO film Five Came Back, which was also directed by John Farrow and starred Chester Morris and Lucille Ball. Richard Carroll, who is credited with writing the story for Back from Eternity, wrote the original story for Five Came Back. A Mexican version of the story was produced in 1948 under the title Los que volvieron.