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The Fat Spy (1966)

Off the coast of Florida; a nearly-deserted island is rumored to have the fountain of youth. A boatload of teenage kids are headed there for a scavenger hunt. Wellington; the island's wealthy owner; is none too happy about that; so he dispatches his daughter; Junior; to get rid of them. She's happy to go because her sweetie; Irving; is the island's only resident. Junior sends Irving to spy on the kids to find out what they know. Irving's twin brother; Herman; and Herman's high-school sweetheart; Camille Salamander; are also headed for the island with their own nefarious plans. Is the fountain of youth real; and if so; who will get to it first?