Twitch or Treat

In the show's third Halloween episode, Endora zaps her house from the previous episode back to the vacant lot. Darrin is furious, and so agrees to allow the party to be held at his house if she undoes the spell. Uncle Arthur insists on being invited to the party, and is joined by many mysterious guests including Boris (Barry Atwater), his feline companion, and Willie Mays. Gladys Kravitz again has the authorities investigate the strange goings on.