S5·E25 Samantha's Power Failure

The Witches Council takes away Samantha's powers when she refuses to break up with Darrin. Uncle Arthur and Serena help out Samantha and, as a result, loses their powers as well. After a hellacious day in the mortal working world, Serena and Uncle Arthur decide that they are better off with their powers. Samantha goes to the Witches Council and tells them they are in the wrong for their ignorance. Then Samantha, Serena, and Uncle Arthur get their powers back.