One Step Beyond (1959)

S2E2 Ordeal on Locust Street

Title: Trials on Locust Street Plot: In a late 19th-century English household, a family conceals a troubling truth: their son is a hybrid of human and aquatic origins. A disgraced physician, desperate to validate his unorthodox theories, seeks to employ his dubious "mind force" technique—a potent form of hypnosis—to change the fate of the tormented youth.