Tricia O'Neil

A temporal rift creates an alternative timeline in which the Federation and Klingon Empire are at war. Tasha is alive and only Guinan can detect that time has been altered.

Commander Riker's duplicate steals the Defiant and prepares to lead the Maquis rebels on an attack against a secret Cardassian base.

The death of a pioneering Ferengi scientist embroils Crusher in a mystery that may end her Starfleet career.

Blalock hunts for evidence that could shatter Cross' alibi, while Appleton defends a young Jew accused of an anti-Semitic crime.

Religious beliefs interfere with Dr Franklin's treatment of a dying child, and he requests Sinclair's help in changing the parents' minds.

A psychologist trains a man's dobermans to respond to a trigger word so he can kill its owner without being at the scene.