(written from a Production point of view)
Gimpel was a dancer in Los Angeles before being brought into stunt work by her agency, Central Casting. One of those jobs was for TOS: "The Cage", given "they knew I could handle costume work and stuff, from dancing." In "The Cage", Gimpel played a Talosian. The costume work led her to being cast as the M-113 creature in TOS: "The Man Trap", filming her scene on Friday 24 June 1966 at Desilu Stage 9. Gimpel also served as an extra in later episodes.