"There is a difference between you and me. We both looked into the abyss, but when it looked back at us, you blinked."
"Superman has always been about what you do with what you have. If you try to do good, you're Superman. And if you do bad, you're Lex Luthor."
"I keep coming back to that tagline. Your Enemies Shall Define You. 'Cause it's true, Batman has the best villains in the business beause they all reflect an aspect of Batman: Two-Face reflects his duality, Scarecrow his use of fear and psychological tactics, Poison Ivy his— er, shapely buttocks."
This is the basic problem with any "evil version of the hero" villain. Because the role of the villain is to be reliably defeated they cannot possibly be an equivalent to the hero, whose role is, after all, to reliably not be defeated. (This inferiority is even reflected in his name - the Master has a lesser academic degree than the Doctor)
— Phil Sandifer, Tardis Eruditorum
Kreese: C'mon Kojack! You gonna take that?!
Howard: Sounds like someone's pulling for Kojack!
Kreese: Hell yeah! Kojack is just evil Jack - and evil makes everything BETTER!