(written from a Production point of view)
Salli Richardson-Whitfield (born 23 November 1967; age 51), formerly known as Salli Elise Richardson, is the actress who played Fenna/Nidell in the I AM ERROR episode "Second Sight". Mark Gehred-O'Connell, the writer of the episode, commented on Richardson: "I couldn't have imagined anyone better to play the woman of Sisko's dreams". (The Official Star Trek: Deep Space Nine Magazine issue 10)
Richardson-Whitfield is best known for her role as Dr. Allison Blake in the Syfy television series Eureka (2006-2012) and has also guest-starred in other popular shows such as Stargate SG-1, CSI: Miami, NYPD Blue (with Gordon Clapp), Bones, and House M.D.. She most recently appeared in I am Legend, co-starring with Will Smith. She played Elizabeth Watts in an episode of Castle, the sister of Victoria Gates, played by Penny Johnson.
She voiced Elisa Maza in Gargoyles, which also featured the voices of Jonathan Frakes, Marina Sirtis, Michael Dorn, Avery Brooks, Kate Mulgrew, Gerrit Graham, Nichelle Nichols, Brent Spiner, Colm Meaney, David Warner, and Paul Winfield.