Marty Ingels guest stars as Dr. Marvin P. Gunderson, who is summoned to examine Kitty Kat, the ailing lion pet of the Addams Family. Morticia (Carolyn Jones) soon decides that it is the cringing doctor who needs help. To build his confidence, human members of the family pretend to be ill so Gunderson can affect cures. Also starring John Astin, Jackie Coogan, and Ted Cassidy.