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Dr. Mark Sinclair, played by George Macready, is a character in the film The Alligator People.

Dr. Sinclair lives at Cypresses Plantation in the town of Bayou Landing in the heart of Louisiana swamp country. He has experimented with limb regrowth for accident victims. Unfortunately his patients began to increasingly take on reptilian traits.

Eventually his most recent patient, Paul Webster, has taken on the facial features of an alligator.