...In this case, we have one excellent guest star with fairly little to do, and a bunch of others who leave virtually no impression. This quixotic bunch of characters ought to be at the very center of the story, especially when the story takes the route of "And Then There Were None" type "character assassination" and we're supposed to care about the people who drop one by one. But only Gotell really delivers, with what little he's given. And the others fall short both as actors and as characters.
Mightn't it have been better to assassinate the "native characters" (save perhaps for Gotell's) out of the way from the get-go, and to place our regular heroes in the position of doing the guest characters' job, solving the mystery, and then confronting the silicon creatures?