Tricia O'Neil

A rift in the space/time continuum brings the Enterprise 22 years into the future, and alters the timeline.

Beverly risks her career to solve the murder of a pioneering Ferengi scientist.

Dr. Eric Mason (Nicol Williamson), a noted psychologist specializing in mind control, uses his expertise to carry out the slaying of his best friend and primary assistant, Dr. Charles Hunter, with the help of his two pet Doberman pinschers. As Lt. Columbo tries to discover why two seemingly lovable Dobermans would, without reason, attack someone they knew, he engages in a head game of his own to expose Dr. Mason before the dogs are put to sleep.

Thomas Riker poses as his twin William in order to steal the U.S.S. Defiant and hand it over to the Maquis, of which he is a member.

Jessica's niece (Alice Krige), an actress in a daytime drama, becomes a suspect when the head writer for the show is murdered.

Jessica's friend (Joan Caulfield) is hit by a car shortly after being notified of her sister's death. With Angela Lansbury, Tricia O'Neil.