Re: Khan the most dangerous enemy of the original crew?
The Enterprise also encountered multiple near-omnipotent beings in the original run of the show. Khan was hardly their most dangerous enemy... but he was probably the most interesting human-scale threat they faced.
I wonder if there's a deleted scene from Space Seed where, unlike with cosmic beings and soulless androids, Kirk's plan to seduce Khan somehow failed.
“You do not use science in order to prove yourself right, you use science in order to become right.”