10 Laziest Star Trek Alien Designs
7. Betazoid
A telepathic species that first appeared in Encounter At Farpoint, it seems that more thought went into the length of Marina Sirtis's skant than the overall design of her race. We discussed some of the original ideas for her character in previous lists, but in practice, the Betazoids would make the perfect spy on Earth - as it's bloody hard to tell them apart.
Effectively, Betazoids are only exposed by the black pupils in their eyes. Originally, they would have an accent that may also give them away - certainly, much has been said about Sirtis's voice in the early seasons of TNG, but this was swept aside once Majel Barrett took on the role of her mother.
While many other Betazoids have appeared through the years - Stadi, Suder, and Tam Elbrun being examples here - Deanna Troi was the template for almost everything that would follow. Part-Betazoids, like Devinoni Ral and Kestra Troi-Riker, could have different pigmentation in their eyes, making them at least a small example of the wide variety that one could expect to see on Betazed - assuming the Dominion left much of the planet standing, that is.