(written from a Production point of view)
Melissa Vinicor (born 23 September 1972; age 47) is an actress who served as a stand-in for Marina Sirtis in the last Star Trek: Enterprise episode "These Are the Voyages...". She was identified in an Enterprise Season 4 DVD Special, where she was named Melissa by first assistant director David Trotti. The call sheet for this episode lists her full name. Vinicor previously stood-in for Jolene Blalock, starting in the latter part of the fourth season when Blalock's stand-in Geneviere Anderson left the series. She also stood-in for several guest stars.
Vinicor was born in Fresno, California. She played supporting roles in the films 12 (2003) and The Last Miracle (2006, with Tommy Hinkley) and served as stand-in for Julianna Margulies on ER, where she also appeared in several episodes as a background performer, for Amy Pietz in Rodney, and for Nancy McKeon in The Division (2001-2004).
In addition she served as stand-in for Rosalyn Sanchez in the comedy Chasing Papi (2003), in the television special Tracey Ullman: Live and Exposed (2005), and in the comedy Our Thirties (2006).