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Leslie Nielsen, who had once studied acting under Bonanza star Lorne Greene in his native Canada, is here cast as Sheriff Paul Rowan, an old friend of Ben Cartwright. Driven to madness after twelve hard years on the job, Rowan holes up in a stable, shooting or threatening to shoot anyone who comes near him. Responding to the pleas of the Sheriff's wife Catherine (Nancy Malone), Ben tries to coax Paul into surrending and seeking out the medical attention he so desperately needs. First shown on January 29, 1967, "The Unseen Wound" was written by Frank Chase.