I am a fan of the awesome “white door from out of nowhere.” Of course, this is because I am a fan of Quantum Leap.
More specifically, the character of Al from Quantum Leap. Dean Stockwell is totally awesome. Everytime he shows up on Battlestar these days, I have to make some joke about how “Ziggy says you only have a 66% chance of making that work, Sam.” Not the most original of comments, but it makes my geeky heart happy.
Frederick the Great is mostly different from Quantum Leap. However, there are some similarities in the “driven by an unknown force to change history for the better” and “striving to put right what once went wrong” parts.