Which Witch Is Which?

S1, E24: Samantha tells Endora she doesn't have time for a dress-fitting. Endora solves Samantha's problem by transforming herself into En-Sam, identical to Samantha. Bob Frazer, an author, falls for En-Sam and they do the town together. Meanwhile, Darrin tells Samantha to expect a visit from his friend, Bob Frazer. Gladys Kravitz, who has seen En-Sam with Bob, is sure the Stephens home is about to break up. After Bob sees Samantha and mistakes her for En-Sam, Samantha explains to Endora the trouble she is causing. Endora is convinced when she learns Bob is expected at the Stephens home. All of En-Sam's efforts to break with Bob fail. Bob is determined to have a showdown with Darrin over Samantha. Samantha tells Darrin that Bob has fallen in love with Endora. Endora, still En-Sam, arrives and Bob thinks En-Sam and Samantha are identical twins. Although Endora promises to give Bob Up, Samantha, knowing her mother, is not sure what she will do.