Madlyn Rhue
Madlyn Rhue , born Madeline Solomon, was a prolific character actress who played Lieutenant Marla McGivers in the  first season episode . She filmed her scenes between Friday  and Thursday  at Desilu Stage 9 and Stage 10.

Rhue made over a hundred appearances on television. Besides her one-time guest spot on Star Trek, she appeared on such programs as Have Gun – Will Travel, The Untouchables, Gunsmoke, Hawaii Five-O, The Man from U.N.C.L.E., Mission: Impossible (which, like Star Trek, was produced by Desilu but was on CBS), Kolchak: The Night Stalker (featuring John Fiedler), and Starsky and Hutch (starring David Soul), among many others. She was also a regular on the short-lived soap opera Executive Suite, on which she co-starred with fellow Star Trek alumni Sharon Acker, Richard Cox, Leigh J. McCloskey, Paul Lambert, Percy Rodriguez, Mitch Ryan, and William Smithers.

In a 1960 episode of Bonanza Rhue played the wife of her "Space Seed" co-star, Ricardo Montalban. TOS actor Anthony Caruso also appeared in that episode. After Star Trek, Rhue and Montalban reunited a second time for an episode of Montalban's Fantasy Island. 

She also appeared in a number of films, including the 1959 war comedy Operation Petticoat (co-starring Robert Gist), 1961's A Majority of One (with George Takei), the 1963 comedy classic It's a Mad Mad Mad Mad World, the 1964 western He Rides Tall (with George Murdock), and 1972's Stand Up and Be Counted (with Gary Lockwood and Michael Ansara). 

In 1977 Rhue was diagnosed with multiple sclerosis and was reportedly eventually confined to using a cane, then crutches, and finally a wheelchair. This is, according to Harve Bennett, what kept McGivers from appearing in . When Bennett discovered Rhue's condition, he wrote McGivers out of the film, feeling it would be unfair to recast the role. (Set Phasers to Stun: 50 Years of Star Trek; ) Between 1982 and 1985, Rhue appeared without assistance on an episode of Diff'rent Strokes which aired 3 days before Khan commenced principal photography, and between 1982 and 1985 was seen standing and walking in her recurring role on the series Fame.

After her diagnosis, she appeared in such shows as Quincy, M.E. (with Robert Ito and Garry Walberg), CHiPs (with Michael Dorn), and the aforementioned Fantasy Island. She accepted regular roles in the soap opera Days of Our Lives and Fame, which co-starred Eric Pierpoint, Graham Jarvis, and Dick Miller. Afterwards, she moved on to a series called Houston Knights, which only lasted one season (1987-1988). Despite her worsening disability, Rhue continued to perform on television, albeit eventually in roles that did not require her to stand up or walk. She went on to have a recurring role on the mystery series Murder, She Wrote, on which she made her final on-screen appearance in 1996, although her health had already forced her to retire three years earlier.

Madlyn Rhue passed away on 16 December 2003, due to her multiple sclerosis coupled with pneumonia and heart failure. She was 68 years old. Her remains were cremated.

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Performers
TOS performers