After one altercation too many with her, Darrin banishes Endora from the house forever. In turn, Endora, without Darrin's knowledge, threatens to turn him into a mouse at midnight unless he rescinds his banishment decree against her. As she knows he won't, Samantha decides to take preventative action by consulting the apothecary to see if there is anything that can be done to counter such a spell that Endora might use.