Joan Swift

Kirk's brother, his wife, and much of the Deneva colony are found dead from a mysterious epidemic of mass insanity. Spock too becomes infected but survives with Vulcan techniques until he is blinded by the cure McCoy tests on him.

Grandpa's secret experiments on a machine that he claims will achieve world peace arouse Herman's curiosity, especially after Grandpa forbids the rest of the family to go down to his workroom in the dungeon to investigate his process.

On Marilyn's birthday, the entire family gathers in the living room to watch as she opens her presents. The last to be opened is her gift from Eddie, something that he admits he found in an old trunk in the attic. Marilyn is pleased to find that the gift is a beautiful emerald ring. Grandpa, however, goes into shock and faints when he sees the ring and Marilyn leaves the house on a date before he recovers.

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

It's Tabitha's birthday and Uncle Arthur shows up for her party. Larry calls Darrin with the news that A. J. Sylvester is at the office and Darrin is badly needed to present a layout, but Darrin refuses to leave the party. Uncle Arthur puts on a magic show but his bunny trick is ruined when a Playboy-type bunny appears and won't disappear. Larry and Mr. Sylvester have come to the party and Sylvester is obviously impressed with the trick.