This alien, who was played by an unknown actor, resembles a Tellarite in the forehead and various additions of hair, but was missing several key costume components, including the pig-like nose and the three-finger gloves. The Star Trek Compendium notes that this was a budget saving measure depicting a more simplified version of the already simplified Tellarite seen in "Whom Gods Destroy".
These (or this) Andorian(s) were (was) played by an unknown actor(s). It is unclear if these (this) technician(s) were (was) meant to be one or two individuals, as both were located near the other, but never together. In the outward shot, the first technician appears on his back, slumped over the console, while the inward shot shows the second technician lying on the floor against the console, opposite of his previous position.
Human technician (female)
This female Human technician was the only survivor, albeit briefly, discovered by the USS Enterprise. When encountered, she was unable to speak, and merely gave off a mysterious croaking sound, similar to what had been previously heard by Mira Romaine following her encounter with the Zetarians. (TOS: "The Lights of Zetar")
Played by Libby Erwin. An early draft of the script described this individual as being a member of a species known as the "Reidonians".