(written from a Production point of view)
Molly Hagan (born 3 August 1961; age 59) played Eris in the Star Trek: Deep Space Nine second season episode "The Jem'Hadar". She played the first Vorta seen on Star Trek. Both "The Search, Part II" and "The Ship" were originally written to have Hagan reprise her role as Eris, but the actress was unavailable both times.
Hagan appeared in the early 1990s sitcom Herman's Head, a show that also starred The Simpsons voice actors Hank Azaria and Yeardley Smith. In 1992, she was considered by the production staff for the role of Jadzia Dax, however, she was unavailable due to appearing in the aforementioned series. 
Hagan also guest starred in Friends, The Golden Girls, True Detective, The Larry Sanders Show, Six Feet Under, Eli Stone, Grey's Anatomy, Bones, Feud, Big Little Lies, Desperate Housewives, Perception, The Mentalist, Masters of Sex, iZombie, Longmire, Seinfeld and The Orville (both with Jason Alexander).
Hagan's motion picture credits included Sully: Miracle on the Hudson, We Are Your Friends, Some Kind of Wonderful, Fresh Horses and Election.
Hagan also starred in the short-lived series The Nutt House, which also featured Gregory Itzin. Hagan also guest-starred in three episodes of Becker, which featured Terry Farrell. In 1994 she guest-starred in the Columbo mystery movie Butterfly in Shades of Grey, in which she played the daughter of William Shatner's character.