10 MORE Star Trek Villains Who Killed The Most
2. Khan
Khan Noonian Singh is often the first name out of Trekkie's mouths when asked who the biggest, baddest villain of them all is. He has the dubious honour of being maniacal in several realities, as well as being a cold-blooded tyrant to boot.
Khan-Prime was a warlord in the original timeline's Eugenics Wars. For a period, he controlled much of Asia, brutally conquering, and disposing of, those he deemed inferior. At that point, it seemed as though everyone who wasn't genetically engineered was inferior, meaning everyone was on his hitlist.
When he found himself in the future, brilliant a tactician as he was, he was foiled not once, but twice, by James T. Kirk. The first time would be a relatively bloodless affair, whereas the second time would see much of the Enterprise's cadet crew, and of course Spock, killed in the attempt to stop him.
The Kelvin-era Khan wasn't much better in terms of his goals, even if Spock got to survive in that universe. He was technically responsible for the death of Kirk, but that didn't last for very long.
Either way, Khan Noonian Singh is still a villain that should send a shiver of fear down the spine of anyone who hears it, or is on the receiving end as from hell's heart, he stabs at thee!