7. Khan Noonien Singh (Ricardo Montalban) from Star Trek II: The Wrath of Khan
There are so many hints to his past I read they actually wrote books about it. However, I never read them and I'm sure I'm not alone, so let's just stick to what's in the movie and one TV episode he was on. He's genetically engineered to be superior physically and intellectually, was a prince who fought in the Eugenics Wars, ruled a quarter of the earth, and ran off with his disciples to freeze in a cryogenic chamber for decades. And that's just from the TV show. We didn't see it, it's only implied, but that's quite a mouthful right there. I've not even gotten into what he did to survive for 15 years on the wasteland that was once Citi Alpha V.