(written from a Production point of view)
Kirk Raymone is the actor who played Duur in the Star Trek: The Original Series second season episode "Friday's Child". He later appeared as a Cloud Guard #1 in the third season episode "The Cloud Minders".
He filmed his scenes for "Friday's Child" between Wednesday 24 May 1967 and Monday 29 May 1967 on location at Vasquez Rocks Natural Area Park and at Desilu Stage 10, and his scenes for "The Cloud Minders" on Wednesday 13 November 1968, also at Stage 10.
Between his two Star Trek appearances, Raymone had two minor roles in the films The Legend of Lylah Clare and Where Were You When the Lights Went Out?.
A decade later, Raymone appeared in the classic 1977 science fiction film Close Encounters of the Third Kind (starring Terri Garr, with Gene Dynarski, J. Patrick McNamara, and Monty O'Grady). The following year, he appeared in the Vietnam War drama Coming Home (1978; with Jonathan Banks, Gary Downey, Bruce French, and Gwen Van Dam). He was credited as Kirk Raymond for these latter two roles.