Dark Shadows - Season 5 Episode 16 : DS-382 1971

Although they make an unlikely pair, Countess Natalie duPres and Abigail Collins do agree that a witch must be behind their families' misfortune. Suspecting Miss Winters to be that witch, Abigail snoops through her room and discovers some damning evidence: a charm bracelet and the transformation of the mysterious cat into her missing brother, Joshua Collins. Abigail decides to send for Reverend Trask, a religious fanatic and witch hunter.