The companion of the mirror universe's Captain Kirk, who helped the visiting Kirk and his crew return home, and who had a counterpart in their own universe.
Marlena Moreau is a lieutenant aboard the ISS Enterprise in the mirror universe, where she is the woman of the ruthless Captain Kirk. When the Kirk of the Federation universe arrives by transporter accident, she soon realises he is not the man she knows.
Using the Tantalus field, a device her captain used to eliminate rivals, she helps Kirk and his officers return home. Back in his own universe, Kirk meets her counterpart, a newly assigned lieutenant. She was played by BarBara Luna.