In the final episode, Endora tries to test out Darrin's honesty by giving him a pin with a spell that makes him tell the truth. Darrin learns that honesty is not exactly the best policy when he jeopardizes an important account. It seems as though he may have lost the account, but the client likes the honesty between Darrin and Larry and gives them a break. As the series ends, Samantha and Darrin tell each other how much they love each other, without the magic of the truth pin.
The Washingtons adjust to life in the twentieth century as they stay with the Stephens. Larry sees them both and decides that it is a great ad campaign for his new clients, the Whirlaway Washing Machine Company. George cannot tell a lie about the washer and, as a result, loses the account for Larry and Darrin. He does the same thing in the courtroom and his charges are dismissed. Then the Washingtons are finally send back to their own time.
The Witches Council wants to test out Adam to see if he is a warlock or a mortal. If he is a mortal, he wilh have to be taken away from the Stephens' household. Maurice helps Adam by giving him powers so that he will not be taken away. Adam is indeed normal, but he does have his own powers tucked away somewhere.
Endora transforms Darrin into a gambler. Samantha inisists Endora remove the spell. Endora makes more trouble by having Darrin bet on a horse named Fancy Dancer that is bound to lose, and Darrin gets Larry and a client to place all bets on Fancy Dancer. Samantha pops to the stables to talk to Dancer about winning the race for her husband and his friends. In the race, it seems like Dancer is bound to come in last, but he pulls through and wins!
Endora's causing trouble again! This time, instead of breaking up a marriage, she's breaking up Darrin's advertising company. She calls up Alonzo, a warlock who casts a spell on Larry, making him like all of his ideas on a carpet account instead of Darrin's. It gets to a point that Darrin quits McMann and Tate, but finds out that this is all Endora's fault. To get even with her, Samantha magically sets up an advertising campaign to handle the carpet account.
Samantha has lost her powers again and it seems like Maurice's magic is gone as well when he visits her. Dr. Bombay discovers that no one should kiss Samantha or they would lose their powers. So, until his powers come back, Maurice lives like a mortal. Maurice then helps out Darrin by winning a chili account for him. And that's when Samantha and Maurice get their powers back respectively.
Samantha Stephens is a seemingly normal suburban housewife who also happens to be a genuine witch, with all the requisite magical powers. Her husband Darrin insists that Samantha keep her witchcraft under wraps, but situations invariably require her to indulge her powers while keeping her bothersome mother Endora at bay.