Star Trek has been running for almost 60 years, leaving behind these 12 huge unsolved mysteries in the process.

So let’s talk about the best of the best. And of course, rank them from best to worst. Which you might think is a “hard” ...

to malleable Mellanoid slime worm Murf, and — perhaps best of all — Zero, a telepathic, non-corporeal Medusan. Their species first appeared in "Star Trek: Original Series" episode "Is There in ...