An evil time-traveling mastermind -who uses his time-traveling powers intelligently? Who has read up on his history and actually has a competent plan for using that to his advantage? Who knows when to jump ship, instead of pointlessly going down with it?!
I - I'm not used to this level of competence in a sliver-age villain. Hell, I'm not used to this level of competence in a modern-age villain! It scares me a little.