Night Gallery (1970)

S2E3 Since Aunt Ada Came to Stay / With Apologies to Mr. Hyde / The Flip-Side of Satan

A college professor begins to suspect that his aunt, who has come to visit, might be an ancient witch intending to take over his wife's body. Meanwhile, Dr. Jekyll experiments with a new potion. In a chilling turn of events, a ruthless disc jockey finds himself chosen as a sinister sacrifice at an abandoned radio station.