(written from a Production point of view)
Susan "Sue" Henley, also known as Sue Rayve is an actress who started her Star Trek connection as a regular background extra during the second season and third season of Star Trek: Deep Space Nine. With the start of Star Trek: Voyager, she tried to get the stand-in job for Genevieve Bujold, but unfortunately did not get the job. Later, thanks to her red hair, she received the stand-in position for Kate Mulgrew, who replaced Bujold as captain of Voyager after a few days of shooting. In addition, Henley appeared as regular background character Ensign Brooks throughout the seven year run of Star Trek: Voyager. Henley also served as stand-in for Gates McFadden for the feature film Star Trek: Insurrection. For most of her appearances, she received no on-screen credit.
The character Mariah Henley in the episode "Learning Curve" was named after Henley. According to an interview with Henley, she did little background work on the first season because of her strong likeness to Mulgrew. Occasionally she wore a wig, which she described as a "hideous black dead-rat-looking wig".  Every time two "Janeways" are seen on screen and no computer effects were integrated, Henley served as on-screen photo double for Mulgrew, for example in the last episode "Endgame", where she replaced Admiral Kathryn Janeway in several scenes. Her costume from this episode was sold off on the It's A Wrap! sale and auction on eBay. 
Star Trek appearances
- DS9: as a Starfleet officer
- VOY: as Ensign Brooks