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A marine biologist (Alex Henteloff) in Hawaii inadvertently discovers a dangerous nerve gas. He plans to present his new discovery to the government, but an evil double agent with the code name "Tree" (Ian McShane) wants to steal the gas and sell it first. The only person who can stop him is a counter-spy known as "Diamond Head" (Roy Thinnes), who goes deep undercover as a gambler, and enters into a deadly cat-and-mouse game with the evil "Tree." Wikipedia