Mala Powers guest stars as Darrin's new client, M.J. Nilesmuster, who turns out to be his former girlfriend, Mary Jane. Certain that the woman harbors ill feelings towards him, Darrin is amazed that Mary Jane agrees to give him her account, but then accuses Samantha of using her witchcraft to cinch the deal. What he doesn't know is that Sam has temporarily lost her powers, and must rely upon the mercurial Dr. Bombay to restore her sorcery skills. Written by Barbara Avedon, "No Zip in My Zap" first aired on October 12, 1967. ~ Hal Erickson, Rovi