Emma Morgan (Adrienne Marden, the jealous wife of religious cult leader Rev. Evan Morgan (John Doucette), is convinced that Morgan's niece Sarah Reynolds (Ina Balin) is possessed by the Devil. It is up to Ben Cartwright to save Sarah from a grisly demise at the hands of Morgan's more rabid followers. Also in the cast are Peter Helm as Gwylem and Angela Dorian (aka Victoria Vetri) as Essie. First broadcast October 17, 1965, "Devil on Her Shoulder" was written by Suzanne Clauser. ~ Hal Erickson, Rovi