There’s been some questions about what the heck kind of alien the Hood’s chief engineer, Zhurlokh, is. He’s a Zaranite, a species introduced in The Motion Picture. The Zaranites were one of the many very expensive aliens designed by Robert Fletcher and placed so far in the background you never realized you saw them.
A Google image search for “Zaranite” turns up this:
You can’t unsee it. Enjoy.