For the mirror universe counterpart, please see Marlena Moreau (mirror).
Marlena Moreau was a Starfleet lieutenant in the 2260s.
In 2267, Moreau was assigned to the USS Enterprise, where she made the acquaintance of Captain James T. Kirk. The captain was initially surprised, as he had just met her counterpart from a parallel universe, who had served as his counterpart's captain's woman aboard the ISS Enterprise. (TOS: "Mirror, Mirror")
Like her counterpart, Moreau was portrayed by Barbara Luna.
The original footage of Moreau's introduction to Kirk was later reused in the 30th Anniversary tribute, "Trials and Tribble-ations", where Benjamin Sisko was juxtaposed in her place during his introduction to Kirk.