Joan Swift

Mind-controlling organisms infesting a colony world attack Kirk's brother and his family, then turn on Spock.

At Tabitha's birthday party, Uncle Arthur volunteers to do tricks. He does a classic rabbit in a hat trick, and instead of a rabbit, he pulls out a Playboy bunny! Darrin's new client, A.J. Sylvester, comes to the party with Larry and instantly falls for Bunny. When A.J. and the bunny have lunch together, A.J.'s ex-girlfriend comes up, sees him and leaves in anger. Samantha invites A.J. and Bunny to dinner and A.J. announces that they are to be engaged. But that doesn't last long when Bunny's rabbit qualities finally come to light.

Kim gets a job as a sales clerk in a dress shop.

Lucy and Mr. Mooney serve as volunteers in a hypnotist's nightclub act.

Grandpa warns Marilyn that the emerald ring Eddie gave her may bring bad luck.

Herman is "disfigured" when he is hit by a bolt of artificial lightning from one of Grandpa's machines.